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t in (-oo:+oo)
(3/2)*t-(1/2)-4 = 0
(3/2)*t-1/2-4 = 0
3/2*t-9/2 = 0 // + 9/2
3/2*t = 9/2 // : 3/2
t = 9/2/3/2
t = 3
t = 3
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