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D( x )
(5-x)/50 = 0
(5-x)/50 = 0
(5-x)/50 = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x in (-oo:5) U (5:+oo)
5 = (x/25)/((5-x)/50) // - (x/25)/((5-x)/50)
5-((x/25)/((5-x)/50)) = 0
5-2*x*(5-x)^-1 = 0
(-2*x)/(5-x)+5 = 0
(-2*x)/(5-x)+(5*(5-x))/(5-x) = 0
5*(5-x)-2*x = 0
25-7*x = 0
(25-7*x)/(5-x) = 0
(25-7*x)/(5-x) = 0 // * 5-x
25-7*x = 0
25-7*x = 0 // - 25
-7*x = -25 // : -7
x = -25/(-7)
x = 25/7
x = 25/7
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