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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7/y+(4*y)/y+6+6 = 5 // - 5
7/y+(4*y)/y-5+6+6 = 0
7*y^-1 = -11 // : 7
y^-1 = -11/7
-1 < 0
1/(y^1) = -11/7 // * y^1
1 = -11/7*y^1 // : -11/7
-7/11 = y^1
y = -7/11
y = -7/11
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