(X+20)+(3x-6)=90

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Solution for (X+20)+(3x-6)=90 equation: 



(X+20)+(3X-6)=90

We move all terms to the left:

(X+20)+(3X-6)-(90)=0

We get rid of parentheses

X+3X+20-6-90=0

We add all the numbers together, and all the variables

4X-76=0

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

4X=76

X=76/4

X=19

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