216=9(7+r)

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Solution for 216=9(7+r) equation: 



216=9(7+r)

We move all terms to the left:

216-(9(7+r))=0

We add all the numbers together, and all the variables

-(9(r+7))+216=0



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

9(r+7)

We multiply parentheses

9r+63

Back to the equation:

-(9r+63)



We get rid of parentheses

-9r-63+216=0

We add all the numbers together, and all the variables

-9r+153=0

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

-9r=-153

r=-153/-9

r=+17

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