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x³+x²-x+5=0
x²(x+x) - 1(x+5)=0
(x²-1)(x+x)(x+5)
x²-1= 0 lub x+x=0 lub x+5=0
x²=1 2x=0 /2 x=-5
x=√1 lub x=-√1 x=0