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D( t )
2*(t+1) = 0
2*(t+1) = 0
2*(t+1) = 0
t+1 = 0 // - 1
t = -1
t in (-oo:-1) U (-1:+oo)
(t+8)/(2*(t+1)) = 0
t+8 = 0 // - 8
t = -8
t = -8
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