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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.25 = (x-75)/x // - (x-75)/x
0.25-((x-75)/x) = 0
(-1*(x-75))/x+0.25 = 0
(-1*(x-75))/x+(0.25*x)/x = 0
0.25*x-1*(x-75) = 0
75-0.75*x = 0
(75-0.75*x)/x = 0
(75-0.75*x)/x = 0 // * x
75-0.75*x = 0
75-0.75*x = 0 // - 75
-0.75*x = -75 // : -0.75
x = -75/(-0.75)
x = 100
x = 100
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