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