14x³+(11x-3x²-3(2x²-1)) = 14x³+(11x-3x²-6x²+3) = 14x³+11x-9x²+3=14x³-9x²+11x+3
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14x³+(11x-3x²-3(2x²-1)) = 14x³+(11x-3x²-6x²+3) = 14x³+11x-9x²+3=14x³-9x²+11x+3