(X+21)+(2x+9)=180

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Solution for (X+21)+(2x+9)=180 equation: 



(X+21)+(2X+9)=180

We move all terms to the left:

(X+21)+(2X+9)-(180)=0

We get rid of parentheses

X+2X+21+9-180=0

We add all the numbers together, and all the variables

3X-150=0

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

3X=150

X=150/3

X=50

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