Rút gọn \(\frac{3(x+y)}{2} = \frac{5x^2 - 5y^2}{A}\)

tìm A (c8,9,10,11,12)
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7) \(\frac{3(x+y)}{2} = \frac{5x^2 - 5y^2}{A}\)
8) \(\frac{x^3 + x^2}{(x-1)(x+1)} = \frac{A}{x-1}\)
9) \(\frac{5x^2 - 13x + 6}{A} = \frac{5x - 3}{2x + 5}\)
10) \(\frac{x^2 - 2x}{2x^2 - 3x - 2} = \frac{x^2 + 2x}{A}\)
11) \(\frac{x^2 - 2x - 8}{2x^2 - 8} = \frac{x - 4}{A}\)
12) \(\frac{A}{7x^2 + 9x + 2} = \frac{4x - 3}{7x + 2}\)