(3x+21)+(6x+15)=180

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Solution for (3x+21)+(6x+15)=180 equation: 



(3x+21)+(6x+15)=180

We move all terms to the left:

(3x+21)+(6x+15)-(180)=0

We get rid of parentheses

3x+6x+21+15-180=0

We add all the numbers together, and all the variables

9x-144=0

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

9x=144

x=144/9

x=16

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