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15=4j+3
We move all terms to the left:
15-(4j+3)=0
We get rid of parentheses
-4j-3+15=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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