-2r+15=2r-21

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Solution for -2r+15=2r-21 equation: 



-2r+15=2r-21

We move all terms to the left:

-2r+15-(2r-21)=0

We get rid of parentheses

-2r-2r+21+15=0

We add all the numbers together, and all the variables

-4r+36=0

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

-4r=-36

r=-36/-4

r=+9

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