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t in (-oo:+oo)
(3/4)*t-(4*t)-7 = -67/4 // + -67/4
(3/4)*t-(4*t)-(-67/4)-7 = 0
(3/4)*t-4*t+67/4-7 = 0
39/4-13/4*t = 0 // - 39/4
-13/4*t = -39/4 // : -13/4
t = -39/4/(-13/4)
t = 3
t = 3
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