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D( t )
6*t-3 = 0
6*t+11 = 0
6*t-3 = 0
6*t-3 = 0
6*t-3 = 0 // + 3
6*t = 3 // : 6
t = 3/6
t = 1/2
6*t+11 = 0
6*t+11 = 0
6*t+11 = 0 // - 11
6*t = -11 // : 6
t = -11/6
t in (-oo:-11/6) U (-11/6:1/2) U (1/2:+oo)
-2/(6*t+11) = 11/(6*t-3) // - 11/(6*t-3)
-2/(6*t+11)-(11/(6*t-3)) = 0
-2/(6*t+11)-11*(6*t-3)^-1 = 0
-2/(6*t+11)-11/(6*t-3) = 0
(-2*(6*t-3))/((6*t+11)*(6*t-3))+(-11*(6*t+11))/((6*t+11)*(6*t-3)) = 0
-2*(6*t-3)-11*(6*t+11) = 0
-78*t-115 = 0
(-78*t-115)/((6*t+11)*(6*t-3)) = 0
(-78*t-115)/((6*t+11)*(6*t-3)) = 0 // * (6*t+11)*(6*t-3)
-78*t-115 = 0
-78*t-115 = 0 // + 115
-78*t = 115 // : -78
t = 115/(-78)
t = -115/78
t = -115/78
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