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-42=0

We move all terms containing x to the left, all other terms to the right

14x=42

x=42/14

x=3

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