-3(-c-21)=-3c-12

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Solution for -3(-c-21)=-3c-12 equation: 



-3(-c-21)=-3c-12

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3(-1c-21)-(-3c-12)=0

We multiply parentheses

3c-(-3c-12)+63=0

We get rid of parentheses

3c+3c+12+63=0

We add all the numbers together, and all the variables

6c+75=0

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

6c=-75

c=-75/6

c=-12+1/2

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