9x-9=21-x

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Solution for 9x-9=21-x equation: 



9x-9=21-x

We move all terms to the left:

9x-9-(21-x)=0

We add all the numbers together, and all the variables

9x-(-1x+21)-9=0

We get rid of parentheses

9x+1x-21-9=0

We add all the numbers together, and all the variables

10x-30=0

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

10x=30

x=30/10

x=3

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