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t in (-oo:+oo)
1/2-(3*t) = 4 // - 4
1/2-(3*t)-4 = 0
1/2-3*t-4 = 0
-3*t-7/2 = 0 // + 7/2
-3*t = 7/2 // : -3
t = 7/2/(-3)
t = -7/6
t = -7/6
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