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t in (-oo:+oo)
1-3*t = -1/4 // + -1/4
1-3*t-(-1/4) = 0
1/4-3*t+1 = 0
5/4-3*t = 0 // - 5/4
-3*t = -5/4 // : -3
t = -5/4/(-3)
t = 5/12
t = 5/12
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