(X+20)+(5x-8)=90

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Solution for (X+20)+(5x-8)=90 equation: 



(X+20)+(5X-8)=90

We move all terms to the left:

(X+20)+(5X-8)-(90)=0

We get rid of parentheses

X+5X+20-8-90=0

We add all the numbers together, and all the variables

6X-78=0

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

6X=78

X=78/6

X=13

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