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