(2x-4)+(x+7)=90.

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Solution for (2x-4)+(x+7)=90. equation: 



(2x-4)+(x+7)=90.

We move all terms to the left:

(2x-4)+(x+7)-(90.)=0

We add all the numbers together, and all the variables

(2x-4)+(x+7)-90=0

We get rid of parentheses

2x+x-4+7-90=0

We add all the numbers together, and all the variables

3x-87=0

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

3x=87

x=87/3

x=29

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