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-7n-15=-8(n+1)
We move all terms to the left:
-7n-15-(-8(n+1))=0
We calculate terms in parentheses: -(-8(n+1)), so:We get rid of parentheses
-8(n+1)
We multiply parentheses
-8n-8
Back to the equation:
-(-8n-8)
-7n+8n+8-15=0
We add all the numbers together, and all the variables
n-7=0
We move all terms containing n to the left, all other terms to the right
n=7
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