a)x²- 3/x - 1 = 2x / x - 1
x²- 3 - 2x = 0
D = b² - 4 ac = 4 + 12 = 16 = 4²
X₁,₂ = -b ± √D / 2a = 2 ± 4 / 2 = 3;-1
b)x - 5 / x + 3 - x - 6 / x + 5 = 0
x - 5 / (x + 3)(x + 5) - x - 6 / (x+5)(x+3) = 0
(x - 5)(x + 3) - (x - 6)(x + 5) = 0
x² + 3x - 5x - 15 - x² - 5x + 6x + 11 = 0
-x = - 4
x = 4