31=-5r+81

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Solution for 31=-5r+81 equation: 



31=-5r+81

We move all terms to the left:

31-(-5r+81)=0

We get rid of parentheses

5r-81+31=0

We add all the numbers together, and all the variables

5r-50=0

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

5r=50

r=50/5

r=10

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