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You just randomly pick some values to satisfy this equation. As 3x is multiple of 3 and so is 27, so y should also be multiple of 3. Moreover you should also have x<y<2x.

Please see my explanation in second post that holds true. Keeping in mind that x, y, and z may or may not be integer. So although 6, 9, 12 are only integer values satisfying the equation, there may be lots of non-integer values e.g. 6.3, 8.1, 12.6 which will be satisfying the equation.

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