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j/3+21=57
We move all terms to the left:
j/3+21-(57)=0
We add all the numbers together, and all the variables
j/3-36=0
We multiply all the terms by the denominator
j-36*3=0
We add all the numbers together, and all the variables
j-108=0
We move all terms containing j to the left, all other terms to the right
j=108
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