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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.5 = (x-5)/x // - (x-5)/x
0.5-((x-5)/x) = 0
(-1*(x-5))/x+0.5 = 0
(-1*(x-5))/x+(0.5*x)/x = 0
0.5*x-1*(x-5) = 0
5-0.5*x = 0
(5-0.5*x)/x = 0
(5-0.5*x)/x = 0 // * x
5-0.5*x = 0
5-0.5*x = 0 // - 5
-0.5*x = -5 // : -0.5
x = -5/(-0.5)
x = 10
x = 10
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