-20=4(r+9)

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Solution for -20=4(r+9) equation: 



-20=4(r+9)

We move all terms to the left:

-20-(4(r+9))=0



We calculate terms in parentheses: -(4(r+9)), so:

4(r+9)

We multiply parentheses

4r+36

Back to the equation:

-(4r+36)



We get rid of parentheses

-4r-36-20=0

We add all the numbers together, and all the variables

-4r-56=0

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

-4r=56

r=56/-4

r=-14

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