SOLUTION: the sum of twelve and an unknown number is four times the unknown number.

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Question 214809: the sum of twelve and an unknown number is four times the unknown number.
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
x is the unknown number
12 + x = 4*x
subtract x from both sides of this equation to get:
12 = 3*x
divide both sides of this equation by 3 to get:
4 = x which is the same as:
x = 4
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let x = 4 in your original equation.
12 + 4 = 4*4 becomes:
16 = 16 confirming that x = 4 is a good number.
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