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t in (-oo:+oo)
5/6-(3*t) = -2/3 // + -2/3
5/6-(3*t)-(-2/3) = 0
5/6-3*t+2/3 = 0
3/2-3*t = 0 // - 3/2
-3*t = -3/2 // : -3
t = -3/2/(-3)
t = 1/2
t = 1/2
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