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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

7n-86=0

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

7n=86

n=86/7

n=12+2/7

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