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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
14 = 4/y // - 4/y
14-(4/y) = 0
14-4*y^-1 = 0
-4*y^-1 = -14 // : -4
y^-1 = 7/2
-1 < 0
1/(y^1) = 7/2 // * y^1
1 = 7/2*y^1 // : 7/2
2/7 = y^1
y = 2/7
y = 2/7
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