r-r+6r=18

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Solution for r-r+6r=18 equation: 



r-r+6r=18

We move all terms to the left:

r-r+6r-(18)=0

We add all the numbers together, and all the variables

6r-18=0

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

6r=18

r=18/6

r=3

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