81=9(c+7)

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Solution for 81=9(c+7) equation: 



81=9(c+7)

We move all terms to the left:

81-(9(c+7))=0



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

9(c+7)

We multiply parentheses

9c+63

Back to the equation:

-(9c+63)



We get rid of parentheses

-9c-63+81=0

We add all the numbers together, and all the variables

-9c+18=0

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

-9c=-18

c=-18/-9

c=+2

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