4x+21=21+4x

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Solution for 4x+21=21+4x equation: 



4x+21=21+4x

We move all terms to the left:

4x+21-(21+4x)=0

We add all the numbers together, and all the variables

4x-(4x+21)+21=0

We get rid of parentheses

4x-4x-21+21=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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