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12=-2(n-77)
We move all terms to the left:
12-(-2(n-77))=0
We calculate terms in parentheses: -(-2(n-77)), so:We get rid of parentheses
-2(n-77)
We multiply parentheses
-2n+154
Back to the equation:
-(-2n+154)
2n-154+12=0
We add all the numbers together, and all the variables
2n-142=0
We move all terms containing n to the left, all other terms to the right
2n=142
n=142/2
n=71
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