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t in (-oo:+oo)
(-2/3)*t+1/6 = (7/2)*t+5/6 // - (7/2)*t+5/6
(-2/3)*t-((7/2)*t)+1/6-(5/6) = 0
(-2/3)*t+(-7/2)*t+1/6-5/6 = 0
-25/6*t-2/3 = 0 // + 2/3
-25/6*t = 2/3 // : -25/6
t = 2/3/(-25/6)
t = -4/25
t = -4/25
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