10-7r=31

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Solution for 10-7r=31 equation: 



10-7r=31

We move all terms to the left:

10-7r-(31)=0

We add all the numbers together, and all the variables

-7r-21=0

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

-7r=21

r=21/-7

r=-3

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