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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.25 = (x-179)/x // - (x-179)/x
0.25-((x-179)/x) = 0
(-1*(x-179))/x+0.25 = 0
(-1*(x-179))/x+(0.25*x)/x = 0
0.25*x-1*(x-179) = 0
179-0.75*x = 0
(179-0.75*x)/x = 0
(179-0.75*x)/x = 0 // * x
179-0.75*x = 0
179-0.75*x = 0 // - 179
-0.75*x = -179 // : -0.75
x = -179/(-0.75)
x = 238.66666667
x = 238.66666667
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