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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
-(10/t)-2/3 = 0
-10*t^-1-2/3 = 0
-10*t^-1 = 2/3 // : -10
t^-1 = -1/15
-1 < 0
1/(t^1) = -1/15 // * t^1
1 = -1/15*t^1 // : -1/15
-15 = t^1
t = -15
t = -15
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