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t in (-oo:+oo)
(1/3)*(t^2-15) = 37 // - 37
(1/3)*(t^2-15)-37 = 0
1/3*(t^2-15)-37 = 0
1/3*(t^2-15)-37 = 0
1/3*t^2-42 = 0
1/3*t^2-42 = 0
1/3*t^2 = 42 // : 1/3
t^2 = 126
t^2 = 126 // ^ 1/2
abs(t) = 3*14^(1/2)
t = 3*14^(1/2) or t = -(3*14^(1/2))
t in { 3*14^(1/2), -(3*14^(1/2)) }
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