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t in (-oo:+oo)
(1/2)*t = t-(17/2) // - t-(17/2)
(1/2)*t-t+17/2 = 0
17/2-1/2*t = 0 // - 17/2
-1/2*t = -17/2 // : -1/2
t = -17/2/(-1/2)
t = 17
t = 17
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