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t in (-oo:+oo)
(2*t^2)/3 = 15-((7*t^1)/3) // - 15-((7*t^1)/3)
(2*t^2)/3+(7*t^1)/3-15 = 0
(2*t^2)/3+(7*t)/3-15 = 0
2/3*t^2+7/3*t-15 = 0
DELTA = (7/3)^2-(-15*2/3*4)
DELTA = 409/9
DELTA > 0
t = ((409/9)^(1/2)-7/3)/(2/3*2) or t = (-(409/9)^(1/2)-7/3)/(2/3*2)
t = 3/4*((409/9)^(1/2)-7/3) or t = -3/4*((409/9)^(1/2)+7/3)
t in { -3/4*((409/9)^(1/2)+7/3), 3/4*((409/9)^(1/2)-7/3) }
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