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D( t )
t+9.4 = 0
t+9.4 = 0
t+9.4 = 0
t+9.4 = 0 // - 9.4
t = -9.4
t in (-oo:-9.4) U (-9.4:+oo)
39.8 = t/(t+9.4) // - t/(t+9.4)
39.8-(t/(t+9.4)) = 0
(-1*t)/(t+9.4)+39.8 = 0
(-1*t)/(t+9.4)+(39.8*(t+9.4))/(t+9.4) = 0
39.8*(t+9.4)-1*t = 0
38.8*t+374.12 = 0
(38.8*t+374.12)/(t+9.4) = 0
(38.8*t+374.12)/(t+9.4) = 0 // * t+9.4
38.8*t+374.12 = 0
38.8*t+374.12 = 0 // - 374.12
38.8*t = -374.12 // : 38.8
t = -374.12/38.8
t = -9.64226804
t = -9.64226804
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