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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
37/y = 7/3 // - 7/3
37/y-(7/3) = 0
37/y-7/3 = 0
37*y^-1 = 7/3 // : 37
y^-1 = 7/111
-1 < 0
1/(y^1) = 7/111 // * y^1
1 = 7/111*y^1 // : 7/111
111/7 = y^1
y = 111/7
y = 111/7
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