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t in (-oo:+oo)
(1/6)*t^2-9 = 0
1/6*t^2 = 9 // : 1/6
t^2 = 54
t^2 = 54 // ^ 1/2
abs(t) = 3*6^(1/2)
t = 3*6^(1/2) or t = -(3*6^(1/2))
t in { 3*6^(1/2), -(3*6^(1/2)) }
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