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1. If \left(y - \frac{1}{y} \right)^3 = 27, then find the value of y^3 - \frac{1}{y^3}.
Answer:
y^3 - \frac{1}{y^3} =
2. If 2x - 3y - 4z = 0, then find 8x^3 - 27y^3 - 64z^3.
Answer:
8x^3 - 27y^3 - 64z^3 =
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