3r-6=-6r+21r

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Solution for 3r-6=-6r+21r equation: 



3r-6=-6r+21r

We move all terms to the left:

3r-6-(-6r+21r)=0

We add all the numbers together, and all the variables

3r-(+15r)-6=0

We get rid of parentheses

3r-15r-6=0

We add all the numbers together, and all the variables

-12r-6=0

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

-12r=6

r=6/-12

r=-1/2

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