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-x⁴+x³
--------
= -x³-2x²+6x+5
x³ -x²
---------
= -3x²+6x+5
3x²-3x
-------
= 3x+5
-3x+3
-------
= 8 reszta
x⁴-2x³-2x²+6x+5=(x-1)(x³-x²-3x+3)+8