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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
18/y = 36/25 // - 36/25
18/y-(36/25) = 0
18/y-36/25 = 0
18*y^-1 = 36/25 // : 18
y^-1 = 2/25
-1 < 0
1/(y^1) = 2/25 // * y^1
1 = 2/25*y^1 // : 2/25
25/2 = y^1
y = 25/2
y = 25/2
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