If (x)\(a) = (y)\(b) = (z)\(c), show that : (x^3)\(a^3) + (y^3)\(b^3) + (z^3)\(c^3) = (3xyz)\(abc).

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If x and y both are positive and (2x² - 5y²) : xy = 1 : 3, find x : y.