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t in (-oo:+oo)
1 = (t^1)/2+9 // - (t^1)/2+9
1-((t^1)/2)-9 = 0
1-(t/2)-9 = 0
-1/2*t-8 = 0 // + 8
-1/2*t = 8 // : -1/2
t = 8/(-1/2)
t = -16
t = -16
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