Tìm x

                      a) 2x(x-5) - x(3+2x) =26               b) 5x(x-1) = x-1                

                      c) 2(x+5) - x2-5x = 0                     d) (2x-3)2-(x+5)2=0

                      e) 3x3 - 48x = 0                              f) x3 + x2 - 4x = 4

                     g) (x - 1)(2x + 3) – x(x - 1) = 0     h) x2 – 4x + 8 = 2x – 1
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