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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(2*t)/t-(5/t)+3+7 = 0
(2*t)/t-5*t^-1+3+7 = 0
-5*t^-1 = -12 // : -5
t^-1 = 12/5
-1 < 0
1/(t^1) = 12/5 // * t^1
1 = 12/5*t^1 // : 12/5
5/12 = t^1
t = 5/12
t = 5/12
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