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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
9/y+1 = 18/54 // - 18/54
9/y-(18/54)+1 = 0
9/y-1/3+1 = 0
9*y^-1 = -2/3 // : 9
y^-1 = -2/27
-1 < 0
1/(y^1) = -2/27 // * y^1
1 = -2/27*y^1 // : -2/27
-27/2 = y^1
y = -27/2
y = -27/2
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