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t in (-oo:+oo)
1/12+1 = 13*t-6*t^2+5 // - 13*t-6*t^2+5
1/12-(-6*t^2)-(13*t)-5+1 = 0
6*t^2-13*t+1/12-5+1 = 0
6*t^2-13*t-47/12 = 0
DELTA = (-13)^2-(-47/12*4*6)
DELTA = 263
DELTA > 0
t = (263^(1/2)+13)/(2*6) or t = (13-263^(1/2))/(2*6)
t = (263^(1/2)+13)/12 or t = (13-263^(1/2))/12
t in { (13-263^(1/2))/12, (263^(1/2)+13)/12 }
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