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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.012 = (108-x)/x // - (108-x)/x
0.012-((108-x)/x) = 0
(-1*(108-x))/x+0.012 = 0
(-1*(108-x))/x+(0.012*x)/x = 0
0.012*x-1*(108-x) = 0
1.012*x-108 = 0
(1.012*x-108)/x = 0
(1.012*x-108)/x = 0 // * x
1.012*x-108 = 0
1.012*x-108 = 0 // + 108
1.012*x = 108 // : 1.012
x = 108/1.012
x = 106.71936759
x = 106.71936759
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