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