2n-12+n+7+n+3n+4=90

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Solution for 2n-12+n+7+n+3n+4=90 equation: 



2n-12+n+7+n+3n+4=90

We move all terms to the left:

2n-12+n+7+n+3n+4-(90)=0

We add all the numbers together, and all the variables

7n-91=0

We move all terms containing n to the left, all other terms to the right

7n=91

n=91/7

n=13

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