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Zatem:
x - 4 = 0 v x + 3 = 0 v x + 5 = 0
x₁ = 4 v x₂ = -3 v x₃ = -5
Suma pierwiastkow równania:
x₁ + x₂ + x₃ = 4 - 3 - 5 = -4