a=9-15

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Solution for a=9-15 equation: 



a=9-15

We move all terms to the left:

a-(9-15)=0

We add all the numbers together, and all the variables

a-(-6)=0

We add all the numbers together, and all the variables

a+6=0

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

a=-6

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