-15=-3-4r

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Solution for -15=-3-4r equation: 



-15=-3-4r

We move all terms to the left:

-15-(-3-4r)=0

We add all the numbers together, and all the variables

-(-4r-3)-15=0

We get rid of parentheses

4r+3-15=0

We add all the numbers together, and all the variables

4r-12=0

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

4r=12

r=12/4

r=3

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