12=3+c

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Solution for 12=3+c equation: 



12=3+c

We move all terms to the left:

12-(3+c)=0

We add all the numbers together, and all the variables

-(c+3)+12=0

We get rid of parentheses

-c-3+12=0

We add all the numbers together, and all the variables

-1c+9=0

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

-c=-9

c=-9/-1

c=+9

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