13r-18=3r+72

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Solution for 13r-18=3r+72 equation: 



13r-18=3r+72

We move all terms to the left:

13r-18-(3r+72)=0

We get rid of parentheses

13r-3r-72-18=0

We add all the numbers together, and all the variables

10r-90=0

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

10r=90

r=90/10

r=9

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