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2n-12+3n+4+n+7=90
We move all terms to the left:
2n-12+3n+4+n+7-(90)=0
We add all the numbers together, and all the variables
6n-91=0
We move all terms containing n to the left, all other terms to the right
6n=91
n=91/6
n=15+1/6
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