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81=6j+27
We move all terms to the left:
81-(6j+27)=0
We get rid of parentheses
-6j-27+81=0
We add all the numbers together, and all the variables
-6j+54=0
We move all terms containing j to the left, all other terms to the right
-6j=-54
j=-54/-6
j=+9
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