9a-a-a-2a-2a=18

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Solution for 9a-a-a-2a-2a=18 equation: 



9a-a-a-2a-2a=18

We move all terms to the left:

9a-a-a-2a-2a-(18)=0

We add all the numbers together, and all the variables

3a-18=0

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

3a=18

a=18/3

a=6

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