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t in (-oo:+oo)
7*(1/3)*t-6 = (8/3)*t-((t+6)/6) // - (8/3)*t-((t+6)/6)
(t+6)/6+7*(1/3)*t-((8/3)*t)-6 = 0
(t+6)/6+7*(1/3)*t+(-8/3)*t-6 = 0
(t+6)/6+(7*t)/3+(-8*t)/3-6 = 0
(3*(t+6))/(3*6)+(6*7*t)/(3*6)+(-8*6*t)/(3*6)+(-6*3*6)/(3*6) = 0
3*(t+6)+6*7*t-8*6*t-6*3*6 = 0
45*t-48*t-108+18 = 0
18-3*t-108 = 0
-3*t-90 = 0
(-3*t-90)/(3*6) = 0
(-3*t-90)/(3*6) = 0 // * 3*6
-3*t-90 = 0
-3*t-90 = 0 // + 90
-3*t = 90 // : -3
t = 90/(-3)
t = -30
t = -30
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