3x + 6 - 3(x + 2), 8x - 4 - 4(2x - 1), 18x + 30 - 6(3x + 5), 10 - 15x - 5(2 - 3x), 10 + 40x - 10(1+ 4x), 4x + 6y - 8 - 2(2x + 3y - 4), 6x2 - 21xy - 3x(2x - 7y), 20xy - 12y2 - 4y(5x - 3y), 15xy + 24 x2 - 3x(5y + 8x), 6x - 8y + 20 - 2(3x - 4y + 10),

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