25 - 5, 14 - 2 and 7, 2x2+6x - 2x and x+3,  15 - 3 and 5, x2+5x+4 - x+1 and x+4, 27 - 9 and 3, x2+3x-18 - x+6 and x-3, 21 - 7 and 3, 3x2 - 3x , x2-x-2 - x-2 and x+1,

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