-72=9(r-10)

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Solution for -72=9(r-10) equation: 



-72=9(r-10)

We move all terms to the left:

-72-(9(r-10))=0



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

9(r-10)

We multiply parentheses

9r-90

Back to the equation:

-(9r-90)



We get rid of parentheses

-9r+90-72=0

We add all the numbers together, and all the variables

-9r+18=0

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

-9r=-18

r=-18/-9

r=+2

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