18a-3a-9a=12

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Solution for 18a-3a-9a=12 equation: 



18a-3a-9a=12

We move all terms to the left:

18a-3a-9a-(12)=0

We add all the numbers together, and all the variables

6a-12=0

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

6a=12

a=12/6

a=2

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