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D( t )
t+(4/10)*t = 0
t+(4/10)*t = 0
t+(4/10)*t = 0
7/5*t = 0 // : 7/5
t = 0
t in (-oo:0) U (0:+oo)
(3*t+(12/5)*t)/(t+(4/10)*t) = 0
(27/5*t)/(7/5*t) = 0
27/5*t = 0 // : 27/5
t = 0
t in { 0}
t belongs to the empty set
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