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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)
8/(11*y-1) = 4/(5*y-1) // - 4/(5*y-1)
8/(11*y-1)-(4/(5*y-1)) = 0
8/(11*y-1)-4*(5*y-1)^-1 = 0
8/(11*y-1)-4/(5*y-1) = 0
(8*(5*y-1))/((11*y-1)*(5*y-1))+(-4*(11*y-1))/((11*y-1)*(5*y-1)) = 0
8*(5*y-1)-4*(11*y-1) = 0
-4*y-4 = 0
(-4*y-4)/((11*y-1)*(5*y-1)) = 0
(-4*y-4)/((11*y-1)*(5*y-1)) = 0 // * (11*y-1)*(5*y-1)
-4*y-4 = 0
-4*y-4 = 0 // + 4
-4*y = 4 // : -4
y = 4/(-4)
y = -1
y = -1
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