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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y = 150 // - 150
4/y-150 = 0
4*y^-1 = 150 // : 4
y^-1 = 75/2
-1 < 0
1/(y^1) = 75/2 // * y^1
1 = 75/2*y^1 // : 75/2
2/75 = y^1
y = 2/75
y = 2/75
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