8=2.5r+15

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Solution for 8=2.5r+15 equation: 



8=2.5r+15

We move all terms to the left:

8-(2.5r+15)=0

We get rid of parentheses

-2.5r-15+8=0

We add all the numbers together, and all the variables

-2.5r-7=0

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

-2.5r=7

r=7/-2.5

r=-2+1/1.25

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