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D( t )
t+3 = 0
t+3 = 0
t+3 = 0
t+3 = 0 // - 3
t = -3
t in (-oo:-3) U (-3:+oo)
(12-(4*t))/(t+3) = 0
(12-4*t)/(t+3) = 0
12-4*t = 0 // - 12
-4*t = -12 // : -4
t = -12/(-4)
t = 3
t = 3
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