Nice Equation

Algebra Level 3

Let a, b, c, x, y, and z be positive real numbers. How many solutions of this equation : x 3 + y 3 + z 3 a 2 b + x 3 + y 3 + z 3 b 2 c + x 3 + y 3 + z 3 c 2 a = 27 x y z a b c 3 a 2 b c + b 2 c a + c 2 a b \frac {x^3+y^3+z^3} {a^2b} + \frac {x^3+y^3+z^3} {b^2c} + \frac {x^3+y^3+z^3} {c^2a} = \frac {27xyz\sqrt[3] {abc} } {a^2bc+b^2ca+c^2ab}

Three solutions No solution Infinite of solutions One solution

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