15-2a=9

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Solution for 15-2a=9 equation: 



15-2a=9

We move all terms to the left:

15-2a-(9)=0

We add all the numbers together, and all the variables

-2a+6=0

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

-2a=-6

a=-6/-2

a=+3

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