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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
14/2 = 49/t // - 49/t
14/2-(49/t) = 0
14/2-49*t^-1 = 0
-49*t^-1 = -7 // : -49
t^-1 = 1/7
-1 < 0
1/(t^1) = 1/7 // * t^1
1 = 1/7*t^1 // : 1/7
7 = t^1
t = 7
t = 7
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