SOLUTION: If you double a number and then add 12, you get one half of the original number. What is the original number?

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Question 446183: If you double a number and then add 12, you get one half of the original number. What is the original number?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
2n+%2B+12+=+n%2F2
<==> 2n+-+n%2F2+=+-12
<==> %283n%29%2F2+=+-12
<==> n+=+-24%2F3
==> n = -8