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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(3/4)/y = -7/48 // + -7/48
(3/4)/y-(-7/48) = 0
(3/4)/y+7/48 = 0
3/4*y^-1 = -7/48 // : 3/4
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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