3r+3r=100

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Solution for 3r+3r=100 equation: 



3r+3r=100

We move all terms to the left:

3r+3r-(100)=0

We add all the numbers together, and all the variables

6r-100=0

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

6r=100

r=100/6

r=16+2/3

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