72=2r*2

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Solution for 72=2r*2 equation: 



72=2r*2

We move all terms to the left:

72-(2r*2)=0

We add all the numbers together, and all the variables

-(+2r*2)+72=0

We get rid of parentheses

-2r*2+72=0

Wy multiply elements

-4r+72=0

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

-4r=-72

r=-72/-4

r=+18

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