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t in (-oo:+oo)
(2/3)*t^2-7 = 17 // - 17
(2/3)*t^2-17-7 = 0
2/3*t^2 = 24 // : 2/3
t^2 = 36
t^2 = 36 // ^ 1/2
abs(t) = 6
t = 6 or t = -6
t in { 6, -6 }
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