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D( t )
t+9 = 0
t+9 = 0
t+9 = 0
t+9 = 0 // - 9
t = -9
t in (-oo:-9) U (-9:+oo)
t/(t+9) = 10 // - 10
t/(t+9)-10 = 0
t/(t+9)+(-10*(t+9))/(t+9) = 0
t-10*(t+9) = 0
-9*t-90 = 0
(-9*t-90)/(t+9) = 0
(-9*t-90)/(t+9) = 0 // * t+9
-9*t-90 = 0
-9*t-90 = 0 // + 90
-9*t = 90 // : -9
t = 90/(-9)
t = -10
t = -10
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