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91=7(j+1)
We move all terms to the left:
91-(7(j+1))=0
We calculate terms in parentheses: -(7(j+1)), so:We get rid of parentheses
7(j+1)
We multiply parentheses
7j+7
Back to the equation:
-(7j+7)
-7j-7+91=0
We add all the numbers together, and all the variables
-7j+84=0
We move all terms containing j to the left, all other terms to the right
-7j=-84
j=-84/-7
j=+12
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