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t in (-oo:+oo)
-6*t-(1/2) = -49/2 // + -49/2
-6*t-(1/2)-(-49/2) = 0
49/2-6*t-1/2 = 0
24-6*t = 0 // - 24
-6*t = -24 // : -6
t = -24/(-6)
t = 4
t = 4
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