7x-21=2x+3-x

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Solution for 7x-21=2x+3-x equation: 



7x-21=2x+3-x

We move all terms to the left:

7x-21-(2x+3-x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

7x-x-3-21=0

We add all the numbers together, and all the variables

6x-24=0

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

6x=24

x=24/6

x=4

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