-40=10(r+9)

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Solution for -40=10(r+9) equation: 



-40=10(r+9)

We move all terms to the left:

-40-(10(r+9))=0



We calculate terms in parentheses: -(10(r+9)), so:

10(r+9)

We multiply parentheses

10r+90

Back to the equation:

-(10r+90)



We get rid of parentheses

-10r-90-40=0

We add all the numbers together, and all the variables

-10r-130=0

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

-10r=130

r=130/-10

r=-13

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