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7n-12=2n+3
We move all terms to the left:
7n-12-(2n+3)=0
We get rid of parentheses
7n-2n-3-12=0
We add all the numbers together, and all the variables
5n-15=0
We move all terms containing n to the left, all other terms to the right
5n=15
n=15/5
n=3
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