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Expand and simplify each of the following expressions.
(a) (x +7) (x + 8)
(b) (3x - 2) (2x + 3)
(c) (5x + 3)(3x + 5)
(d) (7x - 4)(4x - 7)
(e) (m - n)(n - m)
(f) (2x -3)(x + 3)