-25=r-15

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Solution for -25=r-15 equation: 



-25=r-15

We move all terms to the left:

-25-(r-15)=0

We get rid of parentheses

-r+15-25=0

We add all the numbers together, and all the variables

-1r-10=0

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

-r=10

r=10/-1

r=-10

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