svp svp je vous en supplie!!!!!

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a) (x - 4)(2 + 6x - x + 4) = (x - 4)(5x + 6)

b) (2x - 3)(x + 1 + 5) = (2x - 3)(x + 6)

c) (x - 2)(x + x + 2) = (x - 2)(2x + 2)

d) (2x - 1) (-x -3 + 2x - 1) = (2x - 1)(x - 4)