3r+2r+r=180

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Solution for 3r+2r+r=180 equation: 



3r+2r+r=180

We move all terms to the left:

3r+2r+r-(180)=0

We add all the numbers together, and all the variables

6r-180=0

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

6r=180

r=180/6

r=30

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