Simplify:
27. (3x + 4) (2x - 3) + (5x - 4)(x + 2) 28. (5x - 3)(x + 4) - (2x+5)(3x - 4)
29. (9x - 7)(2x - 5) – (3x – 8)(5x - 3) 30. (2x + 5y)(3x + 4y) -(7x + 3y)(2x + y)
31. (3x2 + 5x – 7)(x - 1) – (x2 - 2x + 3)(x + 4)
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