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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/9 = 14/y // - 14/y
4/9-(14/y) = 0
4/9-14*y^-1 = 0
-14*y^-1 = -4/9 // : -14
y^-1 = 2/63
-1 < 0
1/(y^1) = 2/63 // * y^1
1 = 2/63*y^1 // : 2/63
63/2 = y^1
y = 63/2
y = 63/2
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