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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
22.8 = (0.5-x)/x // - (0.5-x)/x
22.8-((0.5-x)/x) = 0
(-1*(0.5-x))/x+22.8 = 0
(-1*(0.5-x))/x+(22.8*x)/x = 0
22.8*x-1*(0.5-x) = 0
23.8*x-0.5 = 0
(23.8*x-0.5)/x = 0
(23.8*x-0.5)/x = 0 // * x
23.8*x-0.5 = 0
23.8*x-0.5 = 0 // + 0.5
23.8*x = 0.5 // : 23.8
x = 0.5/23.8
x = 0.0210084
x = 0.0210084
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