(12x+7)+(6x-7)=90

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Solution for (12x+7)+(6x-7)=90 equation: 



(12x+7)+(6x-7)=90

We move all terms to the left:

(12x+7)+(6x-7)-(90)=0

We get rid of parentheses

12x+6x+7-7-90=0

We add all the numbers together, and all the variables

18x-90=0

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

18x=90

x=90/18

x=5

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