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-18-2n=-3(n+5)
We move all terms to the left:
-18-2n-(-3(n+5))=0
We calculate terms in parentheses: -(-3(n+5)), so:We get rid of parentheses
-3(n+5)
We multiply parentheses
-3n-15
Back to the equation:
-(-3n-15)
-2n+3n+15-18=0
We add all the numbers together, and all the variables
n-3=0
We move all terms containing n to the left, all other terms to the right
n=3
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