9=7c-9

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Solution for 9=7c-9 equation: 



9=7c-9

We move all terms to the left:

9-(7c-9)=0

We get rid of parentheses

-7c+9+9=0

We add all the numbers together, and all the variables

-7c+18=0

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

-7c=-18

c=-18/-7

c=2+4/7

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