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D( x )
4*x-2 = 0
4*x-2 = 0
4*x-2 = 0
4*x-2 = 0 // + 2
4*x = 2 // : 4
x = 2/4
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
(3*x-12)/(4*x-2) = 0
3*x-12 = 0 // + 12
3*x = 12 // : 3
x = 12/3
x = 4
x = 4
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