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D( y )
11*y-1 = 0
5*y-1 = 0
11*y-1 = 0
11*y-1 = 0
11*y-1 = 0 // + 1
11*y = 1 // : 11
y = 1/11
5*y-1 = 0
5*y-1 = 0
5*y-1 = 0 // + 1
5*y = 1 // : 5
y = 1/5
y in (-oo:1/11) U (1/11:1/5) U (1/5:+oo)
6/(11*y-1) = 3/(5*y-1) // - 3/(5*y-1)
6/(11*y-1)-(3/(5*y-1)) = 0
6/(11*y-1)-3*(5*y-1)^-1 = 0
6/(11*y-1)-3/(5*y-1) = 0
(6*(5*y-1))/((11*y-1)*(5*y-1))+(-3*(11*y-1))/((11*y-1)*(5*y-1)) = 0
6*(5*y-1)-3*(11*y-1) = 0
-3*y-3 = 0
(-3*y-3)/((11*y-1)*(5*y-1)) = 0
(-3*y-3)/((11*y-1)*(5*y-1)) = 0 // * (11*y-1)*(5*y-1)
-3*y-3 = 0
-3*y-3 = 0 // + 3
-3*y = 3 // : -3
y = 3/(-3)
y = -1
y = -1
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