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-140=-7(n+8)
We move all terms to the left:
-140-(-7(n+8))=0
We calculate terms in parentheses: -(-7(n+8)), so:We get rid of parentheses
-7(n+8)
We multiply parentheses
-7n-56
Back to the equation:
-(-7n-56)
7n+56-140=0
We add all the numbers together, and all the variables
7n-84=0
We move all terms containing n to the left, all other terms to the right
7n=84
n=84/7
n=12
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