83=31r+21

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Solution for 83=31r+21 equation: 



83=31r+21

We move all terms to the left:

83-(31r+21)=0

We get rid of parentheses

-31r-21+83=0

We add all the numbers together, and all the variables

-31r+62=0

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

-31r=-62

r=-62/-31

r=+2

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