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t in (-oo:+oo)
3-(t/8) = 9/2 // - 9/2
3-(t/8)-(9/2) = 0
3-(t/8)-9/2 = 0
-1/8*t-3/2 = 0 // + 3/2
-1/8*t = 3/2 // : -1/8
t = 3/2/(-1/8)
t = -12
t = -12
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