-21+3r=9(2r+8)

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Solution for -21+3r=9(2r+8) equation: 



-21+3r=9(2r+8)

We move all terms to the left:

-21+3r-(9(2r+8))=0



We calculate terms in parentheses: -(9(2r+8)), so:

9(2r+8)

We multiply parentheses

18r+72

Back to the equation:

-(18r+72)



We get rid of parentheses

3r-18r-72-21=0

We add all the numbers together, and all the variables

-15r-93=0

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

-15r=93

r=93/-15

r=-6+1/5

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