9r+18=72

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Solution for 9r+18=72 equation: 



9r+18=72

We move all terms to the left:

9r+18-(72)=0

We add all the numbers together, and all the variables

9r-54=0

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

9r=54

r=54/9

r=6

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