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D( x )
x/100 = 0
x/100 = 0
x/100 = 0
1/100*x = 0 // : 1/100
x = 0
x in (-oo:0) U (0:+oo)
8 = ((10-x)/20)/(x/100) // - ((10-x)/20)/(x/100)
8-(((10-x)/20)/(x/100)) = 0
8-5*x^-1*(10-x) = 0
8-5*x^-1*(10-x) = 0
13-50*x^-1 = 0
13-50*x^-1 = 0
-50*x^-1 = -13 // : -50
x^-1 = 13/50
-1 < 0
1/(x^1) = 13/50 // * x^1
1 = 13/50*x^1 // : 13/50
50/13 = x^1
x = 50/13
x = 50/13
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