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55=4(3n+7)-5(n-4)
We move all terms to the left:
55-(4(3n+7)-5(n-4))=0
We calculate terms in parentheses: -(4(3n+7)-5(n-4)), so:We get rid of parentheses
4(3n+7)-5(n-4)
We multiply parentheses
12n-5n+28+20
We add all the numbers together, and all the variables
7n+48
Back to the equation:
-(7n+48)
-7n-48+55=0
We add all the numbers together, and all the variables
-7n+7=0
We move all terms containing n to the left, all other terms to the right
-7n=-7
n=-7/-7
n=1
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