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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7-(6/y) = 5 // - 5
7-(6/y)-5 = 0
7-6*y^-1-5 = 0
-6*y^-1 = -2 // : -6
y^-1 = 1/3
-1 < 0
1/(y^1) = 1/3 // * y^1
1 = 1/3*y^1 // : 1/3
3 = y^1
y = 3
y = 3
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