3(7x-7)=21

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Solution for 3(7x-7)=21 equation: 



3(7x-7)=21

We move all terms to the left:

3(7x-7)-(21)=0

We multiply parentheses

21x-21-21=0

We add all the numbers together, and all the variables

21x-42=0

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

21x=42

x=42/21

x=2

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