If `(2a - 3b)/(2a+3b) = 1/3`, then find the value of `(2a^(3) - 3b^(3))/(2a^(3) + 3b^(3))`.

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If `(2a - 3b)/(2a+3b) = 1/3`, then find the value of `(2a^(3) - 3b^(3))/(2a^(3) + 3b^(3))`.
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