Tìm x:
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19) \( 3\sqrt{4x + 4} - \sqrt{9x + 9} - 8\sqrt{\frac{x + 1}{16}} = 5 \)
20) \( \sqrt{9x - 45} - \sqrt{x - 5} = \frac{1}{2}\sqrt{4x - 20} \)
21) \( \sqrt{4x - 8} - \frac{1}{3}\sqrt{9x - 18} = 3\sqrt{x - 2} - 1 \)
22) \( \sqrt{9x + 18} + \frac{1}{4}\sqrt{16x + 32 - 2\sqrt{x + 2}} = 4 \)
19) \( 3\sqrt{4x + 4} - \sqrt{9x + 9} - 8\sqrt{\frac{x + 1}{16}} = 5 \)
20) \( \sqrt{9x - 45} - \sqrt{x - 5} = \frac{1}{2}\sqrt{4x - 20} \)
21) \( \sqrt{4x - 8} - \frac{1}{3}\sqrt{9x - 18} = 3\sqrt{x - 2} - 1 \)
22) \( \sqrt{9x + 18} + \frac{1}{4}\sqrt{16x + 32 - 2\sqrt{x + 2}} = 4 \)