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t in (-oo:+oo)
(1/2)*t+1 = 21/22 // - 21/22
(1/2)*t-(21/22)+1 = 0
(1/2)*t-21/22+1 = 0
1/2*t+1/22 = 0 // - 1/22
1/2*t = -1/22 // : 1/2
t = -1/22/1/2
t = -1/11
t = -1/11
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