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21=8j-27
We move all terms to the left:
21-(8j-27)=0
We get rid of parentheses
-8j+27+21=0
We add all the numbers together, and all the variables
-8j+48=0
We move all terms containing j to the left, all other terms to the right
-8j=-48
j=-48/-8
j=+6
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