12r+3r-6r=72

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Solution for 12r+3r-6r=72 equation: 



12r+3r-6r=72

We move all terms to the left:

12r+3r-6r-(72)=0

We add all the numbers together, and all the variables

9r-72=0

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

9r=72

r=72/9

r=8

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