9r+2r-9r-r=18

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Solution for 9r+2r-9r-r=18 equation: 



9r+2r-9r-r=18

We move all terms to the left:

9r+2r-9r-r-(18)=0

We add all the numbers together, and all the variables

r-18=0

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

r=18

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