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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.15 = (11270-x)/x // - (11270-x)/x
0.15-((11270-x)/x) = 0
(-1*(11270-x))/x+0.15 = 0
(-1*(11270-x))/x+(0.15*x)/x = 0
0.15*x-1*(11270-x) = 0
1.15*x-11270 = 0
(1.15*x-11270)/x = 0
(1.15*x-11270)/x = 0 // * x
1.15*x-11270 = 0
1.15*x-11270 = 0 // + 11270
1.15*x = 11270 // : 1.15
x = 11270/1.15
x = 9800
x = 9800
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