(3x+21)=21

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



(3x+21)=21

We move all terms to the left:

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

We get rid of 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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