-22.5=2.5r

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Solution for -22.5=2.5r equation: 



-22.5=2.5r

We move all terms to the left:

-22.5-(2.5r)=0

We add all the numbers together, and all the variables

-(+2.5r)-22.5=0

We get rid of parentheses

-2.5r-22.5=0

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

-2.5r=22.5

r=22.5/-2.5

r=-9

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