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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/y = 7/12 // - 7/12
3/y-(7/12) = 0
3/y-7/12 = 0
3*y^-1 = 7/12 // : 3
y^-1 = 7/36
-1 < 0
1/(y^1) = 7/36 // * y^1
1 = 7/36*y^1 // : 7/36
36/7 = y^1
y = 36/7
y = 36/7
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