SOLUTION: if four is added to a certain number, the result will be the same if twice the number is subtracted to 31. what is the number?

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Question 910255: if four is added to a certain number, the result will be the same if twice the number is subtracted to 31. what is the number?
Answer by Lenzky(18) About Me  (Show Source):
You can put this solution on YOUR website!
Let x be the number.
x+4 = 31-2x
combine similar terms
x+2x = 31-4
3x = 27 divide both side by 3 to get the value of x
x = 9
CHECKING:
9+4 = 31-(2)(9)
13 = 31-18
13 = 13