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488=-5n+7(-7n+8)
We move all terms to the left:
488-(-5n+7(-7n+8))=0
We calculate terms in parentheses: -(-5n+7(-7n+8)), so:We get rid of parentheses
-5n+7(-7n+8)
We multiply parentheses
-5n-49n+56
We add all the numbers together, and all the variables
-54n+56
Back to the equation:
-(-54n+56)
54n-56+488=0
We add all the numbers together, and all the variables
54n+432=0
We move all terms containing n to the left, all other terms to the right
54n=-432
n=-432/54
n=-8
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