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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10 = (100-x)/x // - (100-x)/x
10-((100-x)/x) = 0
(-1*(100-x))/x+10 = 0
(-1*(100-x))/x+(10*x)/x = 0
10*x-1*(100-x) = 0
11*x-100 = 0
(11*x-100)/x = 0
(11*x-100)/x = 0 // * x
11*x-100 = 0
11*x-100 = 0 // + 100
11*x = 100 // : 11
x = 100/11
x = 100/11
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