-12+2r+2r=r-3

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Solution for -12+2r+2r=r-3 equation: 



-12+2r+2r=r-3

We move all terms to the left:

-12+2r+2r-(r-3)=0

We add all the numbers together, and all the variables

4r-(r-3)-12=0

We get rid of parentheses

4r-r+3-12=0

We add all the numbers together, and all the variables

3r-9=0

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

3r=9

r=9/3

r=3

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