9=3(r-4)

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Solution for 9=3(r-4) equation: 



9=3(r-4)

We move all terms to the left:

9-(3(r-4))=0



We calculate terms in parentheses: -(3(r-4)), so:

3(r-4)

We multiply parentheses

3r-12

Back to the equation:

-(3r-12)



We get rid of parentheses

-3r+12+9=0

We add all the numbers together, and all the variables

-3r+21=0

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

-3r=-21

r=-21/-3

r=+7

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