12r-9r=18

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Solution for 12r-9r=18 equation: 



12r-9r=18

We move all terms to the left:

12r-9r-(18)=0

We add all the numbers together, and all the variables

3r-18=0

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

3r=18

r=18/3

r=6

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