81=9c,c=8

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Solution for 81=9c,c=8 equation: 



81=9c.c=8

We move all terms to the left:

81-(9c.c)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

-9c.c+81=0

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

-9c.c=-81

c=-81/1

c=-81

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