31. (3x2 + 5x – 7)(x - 1) - (x2 – 2x +3)(x +4)
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(6+5x-7)x-1-(2x-2x+3)x+4
(5x-1)x-1-3×x+4
5x-1× x-1-3x+4
2x-1-1-3+4×x
2x-1×x
2x-x
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