4x2 + 3 + 5x2 + 18, 8x2 + 18, 9x2 + 20, 9x2 + 21, 9x2 + 24, 7a + 4b + 5c +6b, 5c + 13b+ 7a, 7a+ 10b + 5c, 10b + 7a, 7a + 4b + 5c, 6y2 + 8y2 + 3x2, 9x2 + 8y2, 6y2+ 11x2, 17y2, 14y2 + 3x2, (7ab - 6x) + ( 9x - 11ab), - 16ab -6x, -18ab + 11x, - 18ab + 3x, - 4ab +3x, (5y + 4a +9 ) - (8y + 2a - 7), - 3y +2a +16, 3y +6a -16, - 3y +6a + 2, -3y +7a +16, (5x2 + 2m +4 ) - (7x2 + 3m - 6), - 2x2 - m -2, - 12x2 - m +10, - 2x2 - m +10, - 2x2 + 5m +10.

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