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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.167 = (10.115-x)/x // - (10.115-x)/x
0.167-((10.115-x)/x) = 0
(-1*(10.115-x))/x+0.167 = 0
(-1*(10.115-x))/x+(0.167*x)/x = 0
0.167*x-1*(10.115-x) = 0
1.167*x-10.115 = 0
(1.167*x-10.115)/x = 0
(1.167*x-10.115)/x = 0 // * x
1.167*x-10.115 = 0
1.167*x-10.115 = 0 // + 10.115
1.167*x = 10.115 // : 1.167
x = 10.115/1.167
x = 8.66752356
x = 8.66752356
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