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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
20/t+30/t+8 = 15/2 // - 15/2
20/t+30/t-(15/2)+8 = 0
20/t+30/t-15/2+8 = 0
50*t^-1 = -1/2 // : 50
t^-1 = -1/100
-1 < 0
1/(t^1) = -1/100 // * t^1
1 = -1/100*t^1 // : -1/100
-100 = t^1
t = -100
t = -100
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