18=9+3c

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Solution for 18=9+3c equation: 



18=9+3c

We move all terms to the left:

18-(9+3c)=0

We add all the numbers together, and all the variables

-(3c+9)+18=0

We get rid of parentheses

-3c-9+18=0

We add all the numbers together, and all the variables

-3c+9=0

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

-3c=-9

c=-9/-3

c=+3

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