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D( x )
(4*x)/2 = 0
(4*x)/2 = 0
(4*x)/2 = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
X = (9*x)/((4*x)/2) // - (9*x)/((4*x)/2)
X-((9*x)/((4*x)/2)) = 0
X-9/2 = 0
X-9/2 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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