15+6a=9

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Solution for 15+6a=9 equation: 



15+6a=9

We move all terms to the left:

15+6a-(9)=0

We add all the numbers together, and all the variables

6a+6=0

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

6a=-6

a=-6/6

a=-1

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