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D( t )
t+4 = 0
t+4 = 0
t+4 = 0
t+4 = 0 // - 4
t = -4
t in (-oo:-4) U (-4:+oo)
6/(t+4) = 42/77 // - 42/77
6/(t+4)-(42/77) = 0
6/(t+4)-6/11 = 0
(6*11)/(11*(t+4))+(-6*(t+4))/(11*(t+4)) = 0
6*11-6*(t+4) = 0
42-6*t = 0
(42-6*t)/(11*(t+4)) = 0
(42-6*t)/(11*(t+4)) = 0 // * 11*(t+4)
42-6*t = 0
42-6*t = 0 // - 42
-6*t = -42 // : -6
t = -42/(-6)
t = 7
t = 7
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