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-7n-2n=-9n
We move all terms to the left:
-7n-2n-(-9n)=0
We add all the numbers together, and all the variables
-9n-(-9n)=0
We get rid of parentheses
-9n+9n=0
We add all the numbers together, and all the variables
=0
n=0/1
n=0
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