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t in (-oo:+oo)
(t/3)^2 = 16 // - 16
(t/3)^2-16 = 0
1/9*t^2 = 16 // : 1/9
t^2 = 144
t^2 = 144 // ^ 1/2
abs(t) = 12
t = 12 or t = -12
t in { 12, -12 }
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