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D( x )
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
(4*x+5)/(2*x-1) = 0
4*x+5 = 0 // - 5
4*x = -5 // : 4
x = -5/4
x = -5/4
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