873=9(10r+7)

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Solution for 873=9(10r+7) equation: 



873=9(10r+7)

We move all terms to the left:

873-(9(10r+7))=0



We calculate terms in parentheses: -(9(10r+7)), so:

9(10r+7)

We multiply parentheses

90r+63

Back to the equation:

-(90r+63)



We get rid of parentheses

-90r-63+873=0

We add all the numbers together, and all the variables

-90r+810=0

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

-90r=-810

r=-810/-90

r=+9

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