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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
52 = 98/t+45 // - 98/t+45
52-(98/t)-45 = 0
52-98*t^-1-45 = 0
-98*t^-1 = -7 // : -98
t^-1 = 1/14
-1 < 0
1/(t^1) = 1/14 // * t^1
1 = 1/14*t^1 // : 1/14
14 = t^1
t = 14
t = 14
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