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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
75/2 = 3000/y // - 3000/y
75/2-(3000/y) = 0
75/2-3000*y^-1 = 0
-3000*y^-1 = -75/2 // : -3000
y^-1 = 1/80
-1 < 0
1/(y^1) = 1/80 // * y^1
1 = 1/80*y^1 // : 1/80
80 = y^1
y = 80
y = 80
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