SOLUTION: please help me to solve this problem: (divide the number in three parts such that the second part is twice the first and the third part is 7 less than the second.)

Question 768338: please help me to solve this problem:
(divide the number in three parts such that the second part is twice the first and the third part is 7 less than the second.)
Answer by josgarithmetic(39625) (Show Source): You can put this solution on YOUR website!
parts x, y, z.
The number, Q=x+y+z

Question is: Find Q.

and this is a far as can be found. You need more information to go any more.
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