6+3=c-12

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Solution for 6+3=c-12 equation: 



6+3=c-12

We move all terms to the left:

6+3-(c-12)=0

We add all the numbers together, and all the variables

-(c-12)+9=0

We get rid of parentheses

-c+12+9=0

We add all the numbers together, and all the variables

-1c+21=0

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

-c=-21

c=-21/-1

c=+21

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