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D( t )
t-1 = 0
6*t-5 = 0
t-1 = 0
t-1 = 0
t-1 = 0 // + 1
t = 1
6*t-5 = 0
6*t-5 = 0
6*t-5 = 0 // + 5
6*t = 5 // : 6
t = 5/6
t in (-oo:5/6) U (5/6:1) U (1:+oo)
1/(t-1)+t/(6*t-5) = 1/6 // - 1/6
1/(t-1)+t/(6*t-5)-(1/6) = 0
1/(t-1)+t/(6*t-5)-1/6 = 0
(1*6*(6*t-5))/(6*(t-1)*(6*t-5))+(6*t*(t-1))/(6*(t-1)*(6*t-5))+(-1*(t-1)*(6*t-5))/(6*(t-1)*(6*t-5)) = 0
1*6*(6*t-5)+6*t*(t-1)-1*(t-1)*(6*t-5) = 0
6*t^2-6*t^2+30*t+11*t-30-5 = 0
41*t-35 = 0
(41*t-35)/(6*(t-1)*(6*t-5)) = 0
(41*t-35)/(6*(t-1)*(6*t-5)) = 0 // * 6*(t-1)*(6*t-5)
41*t-35 = 0
41*t-35 = 0 // + 35
41*t = 35 // : 41
t = 35/41
t = 35/41
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