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