: Tìm x biết
a) 4x ( x - 5) - ( x -1)(4x - 3) = 5b) (2x -1)( x - 2) - ( x + 3)(2x - 7) = 3c) ( x + 3)( x - 4) + ( x -1)( x +1) = 10d) 8x ( x - 3) - 8( x -1)( x +1) = 20
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