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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1.5 = 50/y // - 50/y
1.5-(50/y) = 0
1.5-50*y^-1 = 0
-50*y^-1 = -1.5 // : -50
y^-1 = 0.03
-1 < 0
1/(y^1) = 0.03 // * y^1
1 = 0.03*y^1 // : 0.03
33.33333333 = y^1
y = 33.33333333
y = 33.33333333
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