3(c-1)=21

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Solution for 3(c-1)=21 equation: 



3(c-1)=21

We move all terms to the left:

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

We multiply parentheses

3c-3-21=0

We add all the numbers together, and all the variables

3c-24=0

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

3c=24

c=24/3

c=8

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