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2014-05-25T11:00:00+03:00
⇒     x^4-x³+2x²-x³+x²-2x+2x²-2x+4-x²+2x³=x^4+4x²+4-3x-3
x^4+4x²-4x-x^4-4x²+3x=1-4
-x=-3    ·(-1)
x=3
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