3(7+x)=21

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



3(7+x)=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(x+7)-21=0

We multiply parentheses

3x+21-21=0

We add all the numbers together, and all the variables

3x=0

x=0/3

x=0

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