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87=3(6n+5)
We move all terms to the left:
87-(3(6n+5))=0
We calculate terms in parentheses: -(3(6n+5)), so:We get rid of parentheses
3(6n+5)
We multiply parentheses
18n+15
Back to the equation:
-(18n+15)
-18n-15+87=0
We add all the numbers together, and all the variables
-18n+72=0
We move all terms containing n to the left, all other terms to the right
-18n=-72
n=-72/-18
n=+4
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