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t in (-oo:+oo)
249/110 = 3*t-((1/2)*t)+9/10 // - 3*t-((1/2)*t)+9/10
(1/2)*t-(3*t)+249/110-(9/10) = 0
(1/2)*t-3*t+249/110-9/10 = 0
15/11-5/2*t = 0 // - 15/11
-5/2*t = -15/11 // : -5/2
t = -15/11/(-5/2)
t = 6/11
t = 6/11
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