15a-9a=18

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Solution for 15a-9a=18 equation: 



15a-9a=18

We move all terms to the left:

15a-9a-(18)=0

We add all the numbers together, and all the variables

6a-18=0

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

6a=18

a=18/6

a=3

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