SOLUTION: six plus an unknown number is equal to twelve decreased by the unknown number. what is the number?

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Question 423964: six plus an unknown number is equal to twelve decreased by the unknown number. what is the number?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
6 + x = 12 - x
==> x + x = 12 - 6
==> 2x = 6
==> x = 3, the unknown number.