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t in (-oo:+oo)
3/5-((t/(-4))*t) = 18 // - 18
3/5-((t/(-4))*t)-18 = 0
(1/4)*t^2+3/5-18 = 0
1/4*t^2 = 87/5 // : 1/4
t^2 = 348/5
t^2 = 348/5 // ^ 1/2
abs(t) = (348/5)^(1/2)
t = (348/5)^(1/2) or t = -(348/5)^(1/2)
t in { (348/5)^(1/2), -(348/5)^(1/2) }
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