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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
28 = (2*x-3)/x // - (2*x-3)/x
28-((2*x-3)/x) = 0
(-1*(2*x-3))/x+28 = 0
(-1*(2*x-3))/x+(28*x)/x = 0
28*x-1*(2*x-3) = 0
26*x+3 = 0
(26*x+3)/x = 0
(26*x+3)/x = 0 // * x
26*x+3 = 0
26*x+3 = 0 // - 3
26*x = -3 // : 26
x = -3/26
x = -3/26
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