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180=12n-4(-5n+7)
We move all terms to the left:
180-(12n-4(-5n+7))=0
We calculate terms in parentheses: -(12n-4(-5n+7)), so:We get rid of parentheses
12n-4(-5n+7)
We multiply parentheses
12n+20n-28
We add all the numbers together, and all the variables
32n-28
Back to the equation:
-(32n-28)
-32n+28+180=0
We add all the numbers together, and all the variables
-32n+208=0
We move all terms containing n to the left, all other terms to the right
-32n=-208
n=-208/-32
n=6+1/2
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