(x+10)+(2x-7)=90

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Solution for (x+10)+(2x-7)=90 equation: 



(x+10)+(2x-7)=90

We move all terms to the left:

(x+10)+(2x-7)-(90)=0

We get rid of parentheses

x+2x+10-7-90=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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