(x+21)+(5x-8)+(3x-31)=90

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Solution for (x+21)+(5x-8)+(3x-31)=90 equation: 



(x+21)+(5x-8)+(3x-31)=90

We move all terms to the left:

(x+21)+(5x-8)+(3x-31)-(90)=0

We get rid of parentheses

x+5x+3x+21-8-31-90=0

We add all the numbers together, and all the variables

9x-108=0

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

9x=108

x=108/9

x=12

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