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12x²-8x²+15x-4x+4x-10x-5+5=0
4x²+5x=0
x(4x+5)=0
x=0 4x+5=0
4x=-5/:4
x=-5/4
x=-1 1/4
miejsce zerowe to x1=0 i x2=-1 1/4
Wiec:
x₁ = 0
x₂ = -5/4 = - 1 1/4