11a-2a-9=18

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Solution for 11a-2a-9=18 equation: 



11a-2a-9=18

We move all terms to the left:

11a-2a-9-(18)=0

We add all the numbers together, and all the variables

9a-27=0

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

9a=27

a=27/9

a=3

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