9=12-3c

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Solution for 9=12-3c equation: 



9=12-3c

We move all terms to the left:

9-(12-3c)=0

We add all the numbers together, and all the variables

-(-3c+12)+9=0

We get rid of parentheses

3c-12+9=0

We add all the numbers together, and all the variables

3c-3=0

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

3c=3

c=3/3

c=1

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