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D( t )
t-1 = 0
2*t+6 = 0
t-1 = 0
t-1 = 0
t-1 = 0 // + 1
t = 1
2*t+6 = 0
2*t+6 = 0
2*t+6 = 0 // - 6
2*t = -6 // : 2
t = -6/2
t = -3
t in (-oo:-3) U (-3:1) U (1:+oo)
2/(2*t+6) = 3/(t-1) // - 3/(t-1)
2/(2*t+6)-(3/(t-1)) = 0
2/(2*t+6)-3*(t-1)^-1 = 0
2/(2*t+6)-3/(t-1) = 0
(2*(t-1))/((2*t+6)*(t-1))+(-3*(2*t+6))/((2*t+6)*(t-1)) = 0
2*(t-1)-3*(2*t+6) = 0
-4*t-20 = 0
(-4*t-20)/((2*t+6)*(t-1)) = 0
(-4*t-20)/((2*t+6)*(t-1)) = 0 // * (2*t+6)*(t-1)
-4*t-20 = 0
-4*t-20 = 0 // + 20
-4*t = 20 // : -4
t = 20/(-4)
t = -5
t = -5
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