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D( t )
2*t-1 = 0
2*t-1 = 0
2*t-1 = 0
2*t-1 = 0 // + 1
2*t = 1 // : 2
t = 1/2
t in (-oo:1/2) U (1/2:+oo)
(7/(2*t-1))*(3*t+4)+2*t = 0
(7*(3*t+4))/(2*t-1)+2*t = 0
(7*(3*t+4))/(2*t-1)+(2*t*(2*t-1))/(2*t-1) = 0
7*(3*t+4)+2*t*(2*t-1) = 0
4*t^2+19*t+28 = 0
4*t^2+19*t+28 = 0
4*t^2+19*t+28 = 0
DELTA = 19^2-(4*4*28)
DELTA = -87
DELTA < 0
1 = 0
1/(2*t-1) = 0
1/(2*t-1) = 0 // * 2*t-1
1 = 0
t belongs to the empty set
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