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t in (-oo:+oo)
1/4-4*t = -13/12 // + -13/12
1/4-4*t-(-13/12) = 0
1/4-4*t+13/12 = 0
4/3-4*t = 0 // - 4/3
-4*t = -4/3 // : -4
t = -4/3/(-4)
t = 1/3
t = 1/3
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