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2n-12=9n+63
We move all terms to the left:
2n-12-(9n+63)=0
We get rid of parentheses
2n-9n-63-12=0
We add all the numbers together, and all the variables
-7n-75=0
We move all terms containing n to the left, all other terms to the right
-7n=75
n=75/-7
n=-10+5/7
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