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