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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7 = 3/y-6 // - 3/y-6
6-(3/y)+7 = 0
6-3*y^-1+7 = 0
-3*y^-1 = -13 // : -3
y^-1 = 13/3
-1 < 0
1/(y^1) = 13/3 // * y^1
1 = 13/3*y^1 // : 13/3
3/13 = y^1
y = 3/13
y = 3/13
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