(2x+20)+(7x-20)=90

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Solution for (2x+20)+(7x-20)=90 equation: 



(2x+20)+(7x-20)=90

We move all terms to the left:

(2x+20)+(7x-20)-(90)=0

We get rid of parentheses

2x+7x+20-20-90=0

We add all the numbers together, and all the variables

9x-90=0

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

9x=90

x=90/9

x=10

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