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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
30/y = 75/135 // - 75/135
30/y-(75/135) = 0
30/y-5/9 = 0
30*y^-1 = 5/9 // : 30
y^-1 = 1/54
-1 < 0
1/(y^1) = 1/54 // * y^1
1 = 1/54*y^1 // : 1/54
54 = y^1
y = 54
y = 54
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