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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
9/y-(1/4) = 0
9/y-1/4 = 0
9*y^-1 = 1/4 // : 9
y^-1 = 1/36
-1 < 0
1/(y^1) = 1/36 // * y^1
1 = 1/36*y^1 // : 1/36
36 = y^1
y = 36
y = 36
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