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t in (-oo:+oo)
(1/5)*t^2-25+0 = 0
(1/5)*t^2-25 = 0
1/5*t^2 = 25 // : 1/5
t^2 = 125
t^2 = 125 // ^ 1/2
abs(t) = 5*5^(1/2)
t = 5*5^(1/2) or t = -(5*5^(1/2))
t in { 5*5^(1/2), -(5*5^(1/2)) }
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