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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

(+9x)-(+8x)-90=0

We get rid of parentheses

9x-8x-90=0

We add all the numbers together, and all the variables

x-90=0

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

x=90

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