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D( y )
1-(y/175) = 0
1-(y/175) = 0
1-(y/175) = 0
1-1/175*y = 0 // - 1
-1/175*y = -1 // : -1/175
y = -1/(-1/175)
y = 175
y in (-oo:175) U (175:+oo)
8.36 = (y/30)/(1-(y/175)) // - (y/30)/(1-(y/175))
8.36-((y/30)/(1-(y/175))) = 0
(-1*1/30*y)/(1-1/175*y)+8.36 = 0
(-1*1/30*y)/(1-1/175*y)+(8.36*(1-1/175*y))/(1-1/175*y) = 0
8.36*(1-1/175*y)-1*1/30*y = 0
8.36-0.0811047944*y = 0
(8.36-0.0811047944*y)/(1-1/175*y) = 0
(8.36-0.0811047944*y)/(1-1/175*y) = 0 // * 1-1/175*y
8.36-0.0811047944*y = 0
8.36-0.0811047944*y = 0 // - 8.36
-0.0811047944*y = -8.36 // : -0.0811047944
y = -8.36/(-0.0811047944)
y = 103.07652047
y = 103.07652047
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