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-37.5=2.5+5r

We move all terms to the left:

-37.5-(2.5+5r)=0

We add all the numbers together, and all the variables

-(5r+2.5)-37.5=0

We get rid of parentheses

-5r-2.5-37.5=0

We add all the numbers together, and all the variables

-5r-40=0

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

-5r=40

r=40/-5

r=-8

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