(X+7)+(3x+15)=90

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Solution for (X+7)+(3x+15)=90 equation: 



(X+7)+(3X+15)=90

We move all terms to the left:

(X+7)+(3X+15)-(90)=0

We get rid of parentheses

X+3X+7+15-90=0

We add all the numbers together, and all the variables

4X-68=0

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

4X=68

X=68/4

X=17

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