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t in (-oo:+oo)
(1/2)*t-t-2 = -9/2 // + -9/2
(1/2)*t-t-(-9/2)-2 = 0
(1/2)*t-t+9/2-2 = 0
5/2-1/2*t = 0 // - 5/2
-1/2*t = -5/2 // : -1/2
t = -5/2/(-1/2)
t = 5
t = 5
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