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-7(7n+1)=-2n-7
We move all terms to the left:
-7(7n+1)-(-2n-7)=0
We multiply parentheses
-49n-(-2n-7)-7=0
We get rid of parentheses
-49n+2n+7-7=0
We add all the numbers together, and all the variables
-47n=0
n=0/-47
n=0
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