Tìm x, biết:. \( \sqrt{5} - \sqrt{4} = 2 \), \( \sqrt{2} + \sqrt{3} + \sqrt{2 - x} = 4 \), \( 8, \sqrt{x + 1}, \sqrt{x + 1} \), \( 12, \sqrt{x + 3} = \sqrt{x - 4} - 4 \)

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1. \( \sqrt{5} - \sqrt{4} = 2 \)

2. \( \sqrt{2} + \sqrt{3} + \sqrt{2 - x} = 4 \)

3. \( 8, \sqrt{x + 1}, \sqrt{x + 1} \)

4. \( 12, \sqrt{x + 3} = \sqrt{x - 4} - 4 \)