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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.25 = (x-150)/x // - (x-150)/x
0.25-((x-150)/x) = 0
(-1*(x-150))/x+0.25 = 0
(-1*(x-150))/x+(0.25*x)/x = 0
0.25*x-1*(x-150) = 0
150-0.75*x = 0
(150-0.75*x)/x = 0
(150-0.75*x)/x = 0 // * x
150-0.75*x = 0
150-0.75*x = 0 // - 150
-0.75*x = -150 // : -0.75
x = -150/(-0.75)
x = 200
x = 200
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