r+2r=100

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Solution for r+2r=100 equation: 



r+2r=100

We move all terms to the left:

r+2r-(100)=0

We add all the numbers together, and all the variables

3r-100=0

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

3r=100

r=100/3

r=33+1/3

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