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D( t )
8*t-14 = 0
8*t-14 = 0
8*t-14 = 0
8*t-14 = 0 // + 14
8*t = 14 // : 8
t = 14/8
t = 7/4
t in (-oo:7/4) U (7/4:+oo)
1/(8*t-14)+2*t = 0
1/(8*t-14)+(2*t*(8*t-14))/(8*t-14) = 0
2*t*(8*t-14)+1 = 0
16*t^2-28*t+1 = 0
16*t^2-28*t+1 = 0
16*t^2-28*t+1 = 0
DELTA = (-28)^2-(1*4*16)
DELTA = 720
DELTA > 0
t = (720^(1/2)+28)/(2*16) or t = (28-720^(1/2))/(2*16)
t = (12*5^(1/2)+28)/32 or t = (28-12*5^(1/2))/32
(t-((28-12*5^(1/2))/32))*(t-((12*5^(1/2)+28)/32)) = 0
((t-((28-12*5^(1/2))/32))*(t-((12*5^(1/2)+28)/32)))/(8*t-14) = 0
((t-((28-12*5^(1/2))/32))*(t-((12*5^(1/2)+28)/32)))/(8*t-14) = 0 // * 8*t-14
(t-((28-12*5^(1/2))/32))*(t-((12*5^(1/2)+28)/32)) = 0
( t-((12*5^(1/2)+28)/32) )
t-((12*5^(1/2)+28)/32) = 0 // + (12*5^(1/2)+28)/32
t = (12*5^(1/2)+28)/32
( t-((28-12*5^(1/2))/32) )
t-((28-12*5^(1/2))/32) = 0 // + (28-12*5^(1/2))/32
t = (28-12*5^(1/2))/32
t in { (12*5^(1/2)+28)/32, (28-12*5^(1/2))/32 }
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