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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
9/y+1 = 18/3 // - 18/3
9/y-(18/3)+1 = 0
9/y-6+1 = 0
9*y^-1 = 5 // : 9
y^-1 = 5/9
-1 < 0
1/(y^1) = 5/9 // * y^1
1 = 5/9*y^1 // : 5/9
9/5 = y^1
y = 9/5
y = 9/5
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