7(-c-12)=-21

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Solution for 7(-c-12)=-21 equation: 



7(-c-12)=-21

We move all terms to the left:

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

We add all the numbers together, and all the variables

7(-1c-12)-(-21)=0

We add all the numbers together, and all the variables

7(-1c-12)+21=0

We multiply parentheses

-7c-84+21=0

We add all the numbers together, and all the variables

-7c-63=0

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

-7c=63

c=63/-7

c=-9

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