-15=-0.2r

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Solution for -15=-0.2r equation: 



-15=-0.2r

We move all terms to the left:

-15-(-0.2r)=0

We get rid of parentheses

0.2r-15=0

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

0.2r=15

r=15/0.2

r=75

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