x²-(m-n)x-mn/x²+(m-n)x-mn·x²-m²/x²-m²
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x²-(m-n)x-mn/x²+(m-n)x-mn·x²-m²/x²-m²
x²-(m-n)x-mn/x²+(m-n)x-mn·x²-m²/x²-m²
x²-(m-n)x-mn/x²+(m-n)x-mn·x²-m²/x²-m²