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-10=3n+7n
We move all terms to the left:
-10-(3n+7n)=0
We add all the numbers together, and all the variables
-(+10n)-10=0
We get rid of parentheses
-10n-10=0
We move all terms containing n to the left, all other terms to the right
-10n=10
n=10/-10
n=-1
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