31=4-9r

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Solution for 31=4-9r equation: 



31=4-9r

We move all terms to the left:

31-(4-9r)=0

We add all the numbers together, and all the variables

-(-9r+4)+31=0

We get rid of parentheses

9r-4+31=0

We add all the numbers together, and all the variables

9r+27=0

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

9r=-27

r=-27/9

r=-3

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