Tìm x, biết: i) \(-\frac{4}{5} x = \frac{9}{2}\) ii) \(3x + 2,4 = 5,16\) iii) \(x - \frac{4}{5} = \frac{5}{4} \cdot \frac{2}{10}\)

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b) Tìm x, biết:
i) \(-\frac{4}{5} x = \frac{9}{2}\)
ii) \(3x + 2,4 = 5,16\)
iii) \(x - \frac{4}{5} = \frac{5}{4} \cdot \frac{2}{10}\)