a-2a=15

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Solution for a-2a=15 equation: 



a-2a=15

We move all terms to the left:

a-2a-(15)=0

We add all the numbers together, and all the variables

-1a-15=0

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

-a=15

a=15/-1

a=-15

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