9x-21=15+5x

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Solution for 9x-21=15+5x equation: 



9x-21=15+5x

We move all terms to the left:

9x-21-(15+5x)=0

We add all the numbers together, and all the variables

9x-(5x+15)-21=0

We get rid of parentheses

9x-5x-15-21=0

We add all the numbers together, and all the variables

4x-36=0

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

4x=36

x=36/4

x=9

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