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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y-(7/y)-(1/12) = 1/3 // - 1/3
5/y-(7/y)-(1/12)-(1/3) = 0
5/y-7*y^-1-1/12-1/3 = 0
-2*y^-1 = 5/12 // : -2
y^-1 = -5/24
-1 < 0
1/(y^1) = -5/24 // * y^1
1 = -5/24*y^1 // : -5/24
-24/5 = y^1
y = -24/5
y = -24/5
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