(x - 3)(x + 4) < 0
(x - 3) * x + (x - 3) * 4 < 0
x * x - 3x + 4x - 12 < 0
x * x + x - 12 < 0
x < 3 т.к. 3 * 3 + 3 - 12 = 0
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(x - 3)(x + 4) < 0
(x - 3) * x + (x - 3) * 4 < 0
x * x - 3x + 4x - 12 < 0
x * x + x - 12 < 0
x < 3 т.к. 3 * 3 + 3 - 12 = 0