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D( x )
(5-x)/100 = 0
(5-x)/100 = 0
(5-x)/100 = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x in (-oo:5) U (5:+oo)
3 = (x/50)/((5-x)/100) // - (x/50)/((5-x)/100)
3-((x/50)/((5-x)/100)) = 0
3-2*x*(5-x)^-1 = 0
(-2*x)/(5-x)+3 = 0
(-2*x)/(5-x)+(3*(5-x))/(5-x) = 0
3*(5-x)-2*x = 0
15-5*x = 0
(15-5*x)/(5-x) = 0
(15-5*x)/(5-x) = 0 // * 5-x
15-5*x = 0
15-5*x = 0 // - 15
-5*x = -15 // : -5
x = -15/(-5)
x = 3
x = 3
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