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D( t )
6*t-18 = 0
6*t-18 = 0
6*t-18 = 0
6*t-18 = 0 // + 18
6*t = 18 // : 6
t = 18/6
t = 3
t in (-oo:3) U (3:+oo)
t*((t^2-9)/3)*(18/(6*t-18)) = 0
(18*t*(t^2-9))/(3*(6*t-18)) = 0
( t )
t = 0
( t^2-9 )
1*t^2 = 9 // : 1
t^2 = 9
t^2 = 9 // ^ 1/2
abs(t) = 3
t = 3 or t = -3
t in { 3}
t in { 0, -3 }
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