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t in (-oo:+oo)
-6 = t/2+1 // - t/2+1
-(t/2)-6-1 = 0
-1/2*t-7 = 0 // + 7
-1/2*t = 7 // : -1/2
t = 7/(-1/2)
t = -14
t = -14
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