(X+21)+(3x+15)=180

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Solution for (X+21)+(3x+15)=180 equation: 



(X+21)+(3X+15)=180

We move all terms to the left:

(X+21)+(3X+15)-(180)=0

We get rid of parentheses

X+3X+21+15-180=0

We add all the numbers together, and all the variables

4X-144=0

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

4X=144

X=144/4

X=36

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