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D( x )
10*x < 0
20*x < 0
10*x < 0
10*x < 0
10*x+0 < 0 // - 0
10*x < 0 // : 10
x < 0/10
x < 0
20*x < 0
20*x < 0
20*x+0 < 0 // - 0
20*x < 0 // : 20
x < 0/20
x < 0
x in <0:+oo)
(20*x)^(1/4)*(10*x)^(3/4) = 0
20^(1/4)*10^(3/4)*x = 0 // : 20^(1/4)*10^(3/4)
x = 0
x = 0
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