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-12=(2n+5)-18
We move all terms to the left:
-12-((2n+5)-18)=0
We calculate terms in parentheses: -((2n+5)-18), so:We get rid of parentheses
(2n+5)-18
We get rid of parentheses
2n+5-18
We add all the numbers together, and all the variables
2n-13
Back to the equation:
-(2n-13)
-2n+13-12=0
We add all the numbers together, and all the variables
-2n+1=0
We move all terms containing n to the left, all other terms to the right
-2n=-1
n=-1/-2
n=1/2
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