3r-3r+3r-r=18

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Solution for 3r-3r+3r-r=18 equation: 



3r-3r+3r-r=18

We move all terms to the left:

3r-3r+3r-r-(18)=0

We add all the numbers together, and all the variables

2r-18=0

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

2r=18

r=18/2

r=9

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