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D( x )
x/5 = 0
x/5 = 0
x/5 = 0
1/5*x = 0 // : 1/5
x = 0
x in (-oo:0) U (0:+oo)
8.5 = (50-(x/1))/(x/5) // - (50-(x/1))/(x/5)
8.5-((50-(x/1))/(x/5)) = 0
8.5-5*x^-1*(50-x) = 0
8.5-5*x^-1*(50-x) = 0
5-250*x^-1+8.5 = 0
5-250*x^-1+8.5 = 0
-250*x^-1 = -(5+8.5) // : -250
x^-1 = (5+8.5)/250
-1 < 0
1/(x^1) = (5+8.5)/250 // * x^1
1 = ((5+8.5)/250)*x^1 // : (5+8.5)/250
250*(5+8.5)^-1 = x^1
x = 250*(5+8.5)^-1
x = 250*(5+8.5)^-1
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