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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y-(7/3) = 0
4/y-7/3 = 0
4*y^-1 = 7/3 // : 4
y^-1 = 7/12
-1 < 0
1/(y^1) = 7/12 // * y^1
1 = 7/12*y^1 // : 7/12
12/7 = y^1
y = 12/7
y = 12/7
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