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7n-5n+2=12+8
We move all terms to the left:
7n-5n+2-(12+8)=0
We add all the numbers together, and all the variables
7n-5n+2-20=0
We add all the numbers together, and all the variables
2n-18=0
We move all terms containing n to the left, all other terms to the right
2n=18
n=18/2
n=9
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