7x+21=21-7x

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Solution for 7x+21=21-7x equation: 



7x+21=21-7x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

7x+7x-21+21=0

We add all the numbers together, and all the variables

14x=0

x=0/14

x=0

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