(2x³-3x²+6)-()=-x³+2x²-6x+15

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(2x³-3x²+6)-()=-x³+2x²-6x+15
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(2x³-3x²+6)-()=-x³+2x²-6x+15
(2x³-3x²+6)-()=-x³+2x²-6x+15

(2x³-3x²+6)-()=-x³+2x²-6x+15
:(2x³-3x²+6)-(3x³-5x²+6x-9 )=-x³+2x²-6x+15