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t in (-oo:+oo)
(-1/3)*t-(3*t)+1 = 23/3 // - 23/3
(-1/3)*t-(3*t)-(23/3)+1 = 0
(-1/3)*t-3*t-23/3+1 = 0
-10/3*t-20/3 = 0 // + 20/3
-10/3*t = 20/3 // : -10/3
t = 20/3/(-10/3)
t = -2
t = -2
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