3x + 6 - 3(x + 2), x2 + 4 - (x 4 - 16)/(x2 - 4), 18x + 30 - 6(3x + 5), 4x2 - 36 - (2x - 6)(2x + 6), x2 - 2x + 4 - (x3 + 8) / (x + 2), x2 - 2x - 3 - (x - 3)(x + 1), 6x2 - 21xy - 3x(2x - 7y), 20xy - 12y2 - 4y(5x - 3y), 15xy + 24x2 - 3x(5y + 8x), 6x - 8y + 20 - 2(3x - 4y + 10),

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