J does not equal a value since you didn't provide an equation; there's no equal sign nor a "right side." You have provided an expression that can be simplified but nothing more. Unfortunately, both equation and expression begin with the letter E in English which, I believe, can lead to the confusion.
Now if 4j-24-6j equals 120 then we have something to work with! So then -24-2j equals 120 and -2j equals 144 and, finally, j equals -72. I hope this helps.
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There are no 'real' numbers that can do that. The numbers are 3 + j sqrt(3) and 3 - j sqrt(3). ( ' j ' is the square root of negative 1 )
In math, j is the imaginary number that is the square root of positive one, but is not equal to one.
There are no brackets!
Infinitely many.
If: 2+10j = -88 Then: j = -9