73=2r+31

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Solution for 73=2r+31 equation: 



73=2r+31

We move all terms to the left:

73-(2r+31)=0

We get rid of parentheses

-2r-31+73=0

We add all the numbers together, and all the variables

-2r+42=0

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

-2r=-42

r=-42/-2

r=+21

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