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