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Solve each of the following equations:
(a) #x^2 + 6x + 8 = 0 #
(b) #2x^2 + 3x - 2 = 0#
(c) #14x^2 - 16x + 2 = 0 #
(d) #4x^2 + 7x - 5 = x^2 - 9 #