-21=c/3+12

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Solution for -21=c/3+12 equation: 



-21=c/3+12

We move all terms to the left:

-21-(c/3+12)=0

We get rid of parentheses

-c/3-12-21=0

We multiply all the terms by the denominator


-c-12*3-21*3=0

We add all the numbers together, and all the variables

-1c-99=0

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

-c=99

c=99/-1

c=-99

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