9x-6x-21=9

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Solution for 9x-6x-21=9 equation: 



9x-6x-21=9

We move all terms to the left:

9x-6x-21-(9)=0

We add all the numbers together, and all the variables

3x-30=0

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

3x=30

x=30/3

x=10

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