r+2r+3r=120

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Solution for r+2r+3r=120 equation: 



r+2r+3r=120

We move all terms to the left:

r+2r+3r-(120)=0

We add all the numbers together, and all the variables

6r-120=0

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

6r=120

r=120/6

r=20

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