-20=3r+2r

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Solution for -20=3r+2r equation: 



-20=3r+2r

We move all terms to the left:

-20-(3r+2r)=0

We add all the numbers together, and all the variables

-(+5r)-20=0

We get rid of parentheses

-5r-20=0

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

-5r=20

r=20/-5

r=-4

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