31=-1+4r

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Solution for 31=-1+4r equation: 



31=-1+4r

We move all terms to the left:

31-(-1+4r)=0

We add all the numbers together, and all the variables

-(4r-1)+31=0

We get rid of parentheses

-4r+1+31=0

We add all the numbers together, and all the variables

-4r+32=0

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

-4r=-32

r=-32/-4

r=+8

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