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12+5j=j-4
We move all terms to the left:
12+5j-(j-4)=0
We get rid of parentheses
5j-j+4+12=0
We add all the numbers together, and all the variables
4j+16=0
We move all terms containing j to the left, all other terms to the right
4j=-16
j=-16/4
j=-4
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