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