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8-2j=2j-4
We move all terms to the left:
8-2j-(2j-4)=0
We get rid of parentheses
-2j-2j+4+8=0
We add all the numbers together, and all the variables
-4j+12=0
We move all terms containing j to the left, all other terms to the right
-4j=-12
j=-12/-4
j=+3
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