8x+3x-21=9x+9

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Solution for 8x+3x-21=9x+9 equation: 



8x+3x-21=9x+9

We move all terms to the left:

8x+3x-21-(9x+9)=0

We add all the numbers together, and all the variables

11x-(9x+9)-21=0

We get rid of parentheses

11x-9x-9-21=0

We add all the numbers together, and all the variables

2x-30=0

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

2x=30

x=30/2

x=15

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