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-2-7n+9n=n-7
We move all terms to the left:
-2-7n+9n-(n-7)=0
We add all the numbers together, and all the variables
2n-(n-7)-2=0
We get rid of parentheses
2n-n+7-2=0
We add all the numbers together, and all the variables
n+5=0
We move all terms containing n to the left, all other terms to the right
n=-5
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