3r+13r+4r=180

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Solution for 3r+13r+4r=180 equation: 



3r+13r+4r=180

We move all terms to the left:

3r+13r+4r-(180)=0

We add all the numbers together, and all the variables

20r-180=0

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

20r=180

r=180/20

r=9

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