3r+90+2r-10=180

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Solution for 3r+90+2r-10=180 equation: 



3r+90+2r-10=180

We move all terms to the left:

3r+90+2r-10-(180)=0

We add all the numbers together, and all the variables

5r-100=0

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

5r=100

r=100/5

r=20

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