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91=-7(n-4)
We move all terms to the left:
91-(-7(n-4))=0
We calculate terms in parentheses: -(-7(n-4)), so:We get rid of parentheses
-7(n-4)
We multiply parentheses
-7n+28
Back to the equation:
-(-7n+28)
7n-28+91=0
We add all the numbers together, and all the variables
7n+63=0
We move all terms containing n to the left, all other terms to the right
7n=-63
n=-63/7
n=-9
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