3x+21=21+2x

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Solution for 3x+21=21+2x equation: 



3x+21=21+2x

We move all terms to the left:

3x+21-(21+2x)=0

We add all the numbers together, and all the variables

3x-(2x+21)+21=0

We get rid of parentheses

3x-2x-21+21=0

We add all the numbers together, and all the variables

x=0

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