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t in (-oo:+oo)
(3/4)*t-(5*t)-1 = -18 // + 18
(3/4)*t-(5*t)-1+18 = 0
(3/4)*t-5*t-1+18 = 0
17-17/4*t = 0 // - 17
-17/4*t = -17 // : -17/4
t = -17/(-17/4)
t = 4
t = 4
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