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