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-4=-2(n-18)
We move all terms to the left:
-4-(-2(n-18))=0
We calculate terms in parentheses: -(-2(n-18)), so:We get rid of parentheses
-2(n-18)
We multiply parentheses
-2n+36
Back to the equation:
-(-2n+36)
2n-36-4=0
We add all the numbers together, and all the variables
2n-40=0
We move all terms containing n to the left, all other terms to the right
2n=40
n=40/2
n=20
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