Tìm x biết

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e) \( 7 \cdot 3^{-1} - 3^{x+2} = -540 \)

g) \( \left( \frac{1}{2} \right)^{2x+1} + \left( \frac{1}{2} \right)^{2x+3} = \frac{5}{32} \)

f) \( \left( \frac{1}{2} \right)^{x} + \left( \frac{1}{2} \right)^{x+1} = \frac{3}{8} \)

h) \( (x^4 - 1) \cdot (\sqrt{x - 3}) = 0 \quad (x \geq 0) \)