(x+1)(x+2)(x-3)(x-4) = (x2 -2x-3)2 -5x2
⇔ x4 -4x3 -7x2 + 28x -6x +24 = x4 + 4x2 + 9 -4x3 -6x2 +12x -5x2
⇔ -7x2 + 28x - 6x + 24 = 4x2 + 9 - 6x2 + 12x - 5x2
⇔ -7x2 + 22x + 24 = -7x2 + 9 + 12x
⇔ 22x + 24 = 9 + 12x
⇔ 22x - 12x = 9 - 24
⇔ 10x = -15
⇔ x = \(-\frac{3}{2}\)
S= {\(-\frac{3}{2}\)}