9r+9=72

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Solution for 9r+9=72 equation: 



9r+9=72

We move all terms to the left:

9r+9-(72)=0

We add all the numbers together, and all the variables

9r-63=0

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

9r=63

r=63/9

r=7

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