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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

n+n+2n+3n+7-12+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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