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-2n+5(1-2n)=-25-7n
We move all terms to the left:
-2n+5(1-2n)-(-25-7n)=0
We add all the numbers together, and all the variables
-2n+5(-2n+1)-(-7n-25)=0
We multiply parentheses
-2n-10n-(-7n-25)+5=0
We get rid of parentheses
-2n-10n+7n+25+5=0
We add all the numbers together, and all the variables
-5n+30=0
We move all terms containing n to the left, all other terms to the right
-5n=-30
n=-30/-5
n=+6
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