(5x+13)+(7x-7)=90

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Solution for (5x+13)+(7x-7)=90 equation: 



(5x+13)+(7x-7)=90

We move all terms to the left:

(5x+13)+(7x-7)-(90)=0

We get rid of parentheses

5x+7x+13-7-90=0

We add all the numbers together, and all the variables

12x-84=0

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

12x=84

x=84/12

x=7

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