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12=4j-8
We move all terms to the left:
12-(4j-8)=0
We get rid of parentheses
-4j+8+12=0
We add all the numbers together, and all the variables
-4j+20=0
We move all terms containing j to the left, all other terms to the right
-4j=-20
j=-20/-4
j=+5
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