21+6r=3r-6

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



21+6r=3r-6

We move all terms to the left:

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

We get rid of parentheses

6r-3r+6+21=0

We add all the numbers together, and all the variables

3r+27=0

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

3r=-27

r=-27/3

r=-9

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