72=2r+9

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Solution for 72=2r+9 equation: 



72=2r+9

We move all terms to the left:

72-(2r+9)=0

We get rid of parentheses

-2r-9+72=0

We add all the numbers together, and all the variables

-2r+63=0

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

-2r=-63

r=-63/-2

r=31+1/2

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