{
let string = "_=![]+[]_=[][_[0]+([][0]+[])[5]+_[2]+_[2]]+[]$=_[3]+_[6]+_[2]+(![]+[])[3]+_[4]+(!![]+[])[1]+_[1]+_[3]+_[4]+_[6]+(!![]+[])[1]_=``[$]+[]_=_[4]+_[6]+_[9]+_[4]+_[9+2]+_[5]+_[2]+_[9+5]$=$[$][$](_[4]+(![]+[])[4]+_[0]+$[6]+_[4]+_[6]+` ` +(![]+[])[4]+$[3]+$[0]+(![]+[])[1]+(5*5)[_](9*3)+(![]+[])[4]+`(`+`'`+`<`+`'`+`)`)()[2]$=``[_[0]+_[4]+_[5]+(9+9+4)[_](9*3)][(9+2)[_](9+9)+_[5]+([][0]+[])[1]+([][0]+[])[2]](``[(9+3)[_](9+9)+_[1]+_[6]+(![]+[])[3]+_[0]+_[4]+(5*6)[_](6*6)+(9+3)[_](9+9)+_[0]+_[1]+_[4]][(![]+[])[0]+_[4]+_[1]+(9+9+4)[_](9*3)+$+(9+8)[_](9+9)+(![]+[])[1]+_[4]+$+_[1]+(9+4)[_](9+9)+(![]+[])[4]](9*8,5*5*4+1,9*3*4, 9*3*4,6*6*3+3,7*7-5,4*8,5*5*5-6,6*6*3+3,6*6*3+6,9*4*3,5*5*4,6*6-3))"
const arr = []
string = string.replace(/`.`/g, m => {
  arr.push(m[1])
  return "R"
})
string = string.split("").join("\n").replace(/R/g, m => "`\n" + arr.shift() + "\n`\n[\n1\n]")
console.log( "Check: " + !!string.split("\n").find(l => l.length > 1) )
console.log( "Lines: " + string.split("\n").length )
console.log("Result: " , eval(string)())
}

{
let string = "_=![]+[]_=[][_[0]+([][0]+[])[5]+_[2]+_[2]]+[]$=_[3]+_[6]+_[2]+(![]+[])[3]+_[4]+(!![]+[])[1]+_[1]+_[3]+_[4]+_[6]+(!![]+[])[1]_=``[$]+[]_=_[4]+_[6]+_[9]+_[4]+_[9+2]+_[5]+_[2]+_[9+5]$=$[$][$](_[4]+(![]+[])[4]+_[0]+$[6]+_[4]+_[6]+` ` +(![]+[])[4]+$[3]+$[0]+(![]+[])[1]+(5*5)[_](9*3)+(![]+[])[4]+`(`+`'`+`<`+`'`+`)`)()[2]$=``[_[0]+_[4]+_[5]+(9+9+4)[_](9*3)][(9+2)[_](9+9)+_[5]+([][0]+[])[1]+([][0]+[])[2]](``[(9+3)[_](9+9)+_[1]+_[6]+(![]+[])[3]+_[0]+_[4]+(5*6)[_](6*6)+(9+3)[_](9+9)+_[0]+_[1]+_[4]][(![]+[])[0]+_[4]+_[1]+(9+9+4)[_](9*3)+$+(9+8)[_](9+9)+(![]+[])[1]+_[4]+$+_[1]+(9+4)[_](9+9)+(![]+[])[4]](9*8,5*5*4+1,9*3*4, 9*3*4,6*6*3+3,7*7-5,4*8,5*5*5-6,6*6*3+3,6*6*3+6,9*4*3,5*5*4,6*6-3))"
const arr = []
string = string.replace(/`.`/g, m => {
  arr.push(m[1])
  return "R"
})
string = string.split("").join("\n").replace(/R/g, m => "`\n" + arr.shift() + "\n`\n[\n1\n]")
console.log( "Check: " + !!string.split("\n").find(l => l.length > 1) )
console.log( "Lines: " + string.split("\n").length )
console.log("Result: " , eval(string)())
}

{
let string = "_=![]+[]_=[][_[0]+([][0]+[])[5]+_[2]+_[2]]+[]$=_[3]+_[6]+_[2]+(![]+[])[3]+_[4]+(!![]+[])[1]+_[1]+_[3]+_[4]+_[6]+(!![]+[])[1]_=``[$]+[]_=_[4]+_[6]+_[9]+_[4]+_[9+2]+_[5]+_[2]+_[9+5]$=$[$][$](_[4]+(![]+[])[4]+_[0]+$[6]+_[4]+_[6]+` ` +(![]+[])[4]+$[3]+$[0]+(![]+[])[1]+(5*5)[_](9*3)+(![]+[])[4]+`(`+`'`+`<`+`'`+`)`)()[2]$=``[_[0]+_[4]+_[5]+(9+9+4)[_](9*3)][(9+2)[_](9+9)+_[5]+([][0]+[])[1]+([][0]+[])[2]](``[(9+3)[_](9+9)+_[1]+_[6]+(![]+[])[3]+_[0]+_[4]+(5*6)[_](6*6)+(9+3)[_](9+9)+_[0]+_[1]+_[4]][(![]+[])[0]+_[4]+_[1]+(9+9+4)[_](9*3)+$+(9+8)[_](9+9)+(![]+[])[1]+_[4]+$+_[1]+(9+4)[_](9+9)+(![]+[])[4]](9*8,5*5*4+1,9*3*4, 9*3*4,6*6*3+3,7*7-5,4*8,5*5*5-6,6*6*3+3,6*6*3+6,9*4*3,5*5*4,6*6-3))"
const arr = []
string = string.replace(/`.`/g, m => {
  arr.push(m[1])
  return "R"
})
string = string.split("").join("\n").replace(/R/g, m => "`\n" + arr.shift() + "\n`\n[\n1\n]")
console.log( "Check: " + !!string.split("\n").find(l => l.length > 1) )
console.log( "Lines: " + string.split("\n").length )
console.log("Result: " , eval(string)())
}