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D( t )
t^2 = 0
t^2 = 0
t^2 = 0
1*t^2 = 0 // : 1
t^2 = 0
t = 0
t in (-oo:0) U (0:+oo)
(0.7*t)/(t^2)+8 = 0
0.7*t^-1 = -8 // : 0.7
t^-1 = -11.42857143
-1 < 0
1/(t^1) = -11.42857143 // * t^1
1 = -11.42857143*t^1 // : -11.42857143
-0.0875 = t^1
t = -0.0875
t = -0.0875
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