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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y+2 = -3/y-2 // + -3/y-2
4/y-(-3/y)+2+2 = 0
4/y+3*y^-1+2+2 = 0
7*y^-1 = -4 // : 7
y^-1 = -4/7
-1 < 0
1/(y^1) = -4/7 // * y^1
1 = -4/7*y^1 // : -4/7
-7/4 = y^1
y = -7/4
y = -7/4
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