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-j+4=j+84
We move all terms to the left:
-j+4-(j+84)=0
We add all the numbers together, and all the variables
-1j-(j+84)+4=0
We get rid of parentheses
-1j-j-84+4=0
We add all the numbers together, and all the variables
-2j-80=0
We move all terms containing j to the left, all other terms to the right
-2j=80
j=80/-2
j=-40
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