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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3-495/y = 45 // - 45
3-495/y-45 = 0
-495*y^-1 = 42 // : -495
y^-1 = -14/165
-1 < 0
1/(y^1) = -14/165 // * y^1
1 = -14/165*y^1 // : -14/165
-165/14 = y^1
y = -165/14
y = -165/14
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