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t in (-oo:+oo)
1/3-5/3 = (4/3)*t+(4/3)*t // - (4/3)*t+(4/3)*t
1/3-((4/3)*t)-((4/3)*t)-5/3 = 0
(-4/3)*t+(-4/3)*t-5/3+1/3 = 0
-8/3*t-4/3 = 0 // + 4/3
-8/3*t = 4/3 // : -8/3
t = 4/3/(-8/3)
t = -1/2
t = -1/2
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