(2x+7)+(6x+3)=90

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Solution for (2x+7)+(6x+3)=90 equation: 



(2x+7)+(6x+3)=90

We move all terms to the left:

(2x+7)+(6x+3)-(90)=0

We get rid of parentheses

2x+6x+7+3-90=0

We add all the numbers together, and all the variables

8x-80=0

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

8x=80

x=80/8

x=10

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