-9=-3(r+20)

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Solution for -9=-3(r+20) equation: 



-9=-3(r+20)

We move all terms to the left:

-9-(-3(r+20))=0



We calculate terms in parentheses: -(-3(r+20)), so:

-3(r+20)

We multiply parentheses

-3r-60

Back to the equation:

-(-3r-60)



We get rid of parentheses

3r+60-9=0

We add all the numbers together, and all the variables

3r+51=0

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

3r=-51

r=-51/3

r=-17

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