3r+11+r+21=180

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Solution for 3r+11+r+21=180 equation: 



3r+11+r+21=180

We move all terms to the left:

3r+11+r+21-(180)=0

We add all the numbers together, and all the variables

4r-148=0

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

4r=148

r=148/4

r=37

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