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t in (-oo:+oo)
(1/2)*t-((3/4)*t)-1 = 3/4 // - 3/4
(1/2)*t-((3/4)*t)-(3/4)-1 = 0
(1/2)*t+(-3/4)*t-3/4-1 = 0
-1/4*t-7/4 = 0 // + 7/4
-1/4*t = 7/4 // : -1/4
t = 7/4/(-1/4)
t = -7
t = -7
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