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