9r-21=3(r-7)+6r

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Solution for 9r-21=3(r-7)+6r equation: 



9r-21=3(r-7)+6r

We move all terms to the left:

9r-21-(3(r-7)+6r)=0



We calculate terms in parentheses: -(3(r-7)+6r), so:

3(r-7)+6r

We add all the numbers together, and all the variables

6r+3(r-7)

We multiply parentheses

6r+3r-21

We add all the numbers together, and all the variables

9r-21

Back to the equation:

-(9r-21)



We get rid of parentheses

9r-9r+21-21=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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