3x-21=7-x

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Solution for 3x-21=7-x equation: 



3x-21=7-x

We move all terms to the left:

3x-21-(7-x)=0

We add all the numbers together, and all the variables

3x-(-1x+7)-21=0

We get rid of parentheses

3x+1x-7-21=0

We add all the numbers together, and all the variables

4x-28=0

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

4x=28

x=28/4

x=7

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