3r+6r=15

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Solution for 3r+6r=15 equation: 



3r+6r=15

We move all terms to the left:

3r+6r-(15)=0

We add all the numbers together, and all the variables

9r-15=0

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

9r=15

r=15/9

r=1+2/3

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