7) \( \sqrt{4x+1} - \sqrt{7-3x} = \frac{7x - 6}{4} \) 8) \( \left( \sqrt{2+x-\sqrt{2-x}}(2-\sqrt{4-x^2}) \right) = 4. \) 9) \( x^2 + x - 3 + 2x^3 - 1 = 4\sqrt{x-1}. \)

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7) \( \sqrt{4x+1} - \sqrt{7-3x} = \frac{7x - 6}{4} \)

8) \( \left( \sqrt{2+x-\sqrt{2-x}}(2-\sqrt{4-x^2}) \right) = 4. \)

9) \( x^2 + x - 3 + 2x^3 - 1 = 4\sqrt{x-1}. \)