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42=4j+6
We move all terms to the left:
42-(4j+6)=0
We get rid of parentheses
-4j-6+42=0
We add all the numbers together, and all the variables
-4j+36=0
We move all terms containing j to the left, all other terms to the right
-4j=-36
j=-36/-4
j=+9
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