-600=10(12+9r)

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Solution for -600=10(12+9r) equation: 



-600=10(12+9r)

We move all terms to the left:

-600-(10(12+9r))=0

We add all the numbers together, and all the variables

-(10(9r+12))-600=0



We calculate terms in parentheses: -(10(9r+12)), so:

10(9r+12)

We multiply parentheses

90r+120

Back to the equation:

-(90r+120)



We get rid of parentheses

-90r-120-600=0

We add all the numbers together, and all the variables

-90r-720=0

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

-90r=720

r=720/-90

r=-8

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