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-15=4-j
We move all terms to the left:
-15-(4-j)=0
We add all the numbers together, and all the variables
-(-1j+4)-15=0
We get rid of parentheses
1j-4-15=0
We add all the numbers together, and all the variables
j-19=0
We move all terms containing j to the left, all other terms to the right
j=19
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