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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6 = 1/y-8 // - 1/y-8
6-(1/y)+8 = 0
6-y^-1+8 = 0
-1*y^-1 = -14 // : -1
y^-1 = 14
-1 < 0
1/(y^1) = 14 // * y^1
1 = 14*y^1 // : 14
1/14 = y^1
y = 1/14
y = 1/14
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