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t in (-oo:+oo)
(1/2)*t+1/2 = 3 // - 3
(1/2)*t+1/2-3 = 0
1/2*t-5/2 = 0 // + 5/2
1/2*t = 5/2 // : 1/2
t = 5/2/1/2
t = 5
t = 5
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