-3=18-3c

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Solution for -3=18-3c equation: 



-3=18-3c

We move all terms to the left:

-3-(18-3c)=0

We add all the numbers together, and all the variables

-(-3c+18)-3=0

We get rid of parentheses

3c-18-3=0

We add all the numbers together, and all the variables

3c-21=0

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

3c=21

c=21/3

c=7

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