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