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9x² - 12x + 4 - x² - 10x - 25 = 0
8x² -22x - 21 = 0
Δ = b² - 4ac = 484 + 672 = 1156
√Δ = 34
x₁ = (22-34)/16 = -3/4 = - 0,75
x₂ = (22+34)/16 = 3,5
x = {-0,75; 3,5}