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t in (-oo:+oo)
t^2 = 7/12 // - 7/12
t^2-(7/12) = 0
t^2-7/12 = 0
1*t^2 = 7/12 // : 1
t^2 = 7/12
t^2 = 7/12 // ^ 1/2
abs(t) = (7/12)^(1/2)
t = (7/12)^(1/2) or t = -(7/12)^(1/2)
t in { (7/12)^(1/2), -(7/12)^(1/2) }
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