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21=7(j-89)
We move all terms to the left:
21-(7(j-89))=0
We calculate terms in parentheses: -(7(j-89)), so:We get rid of parentheses
7(j-89)
We multiply parentheses
7j-623
Back to the equation:
-(7j-623)
-7j+623+21=0
We add all the numbers together, and all the variables
-7j+644=0
We move all terms containing j to the left, all other terms to the right
-7j=-644
j=-644/-7
j=+92
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