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t in (-oo:+oo)
(t/4)*t = 28 // - 28
(t/4)*t-28 = 0
1/4*t^2 = 28 // : 1/4
t^2 = 112
t^2 = 112 // ^ 1/2
abs(t) = 4*7^(1/2)
t = 4*7^(1/2) or t = -(4*7^(1/2))
t in { 4*7^(1/2), -(4*7^(1/2)) }
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