(3r+8)+(4r-2)+(2r+12)=180

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Solution for (3r+8)+(4r-2)+(2r+12)=180 equation: 



(3r+8)+(4r-2)+(2r+12)=180

We move all terms to the left:

(3r+8)+(4r-2)+(2r+12)-(180)=0

We get rid of parentheses

3r+4r+2r+8-2+12-180=0

We add all the numbers together, and all the variables

9r-162=0

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

9r=162

r=162/9

r=18

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