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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.2 = (10.15-x)/x // - (10.15-x)/x
0.2-((10.15-x)/x) = 0
(-1*(10.15-x))/x+0.2 = 0
(-1*(10.15-x))/x+(0.2*x)/x = 0
0.2*x-1*(10.15-x) = 0
1.2*x-10.15 = 0
(1.2*x-10.15)/x = 0
(1.2*x-10.15)/x = 0 // * x
1.2*x-10.15 = 0
1.2*x-10.15 = 0 // + 10.15
1.2*x = 10.15 // : 1.2
x = 10.15/1.2
x = 8.45833333
x = 8.45833333
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