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t in (-oo:+oo)
-6 = (7/4)*t // - (7/4)*t
-((7/4)*t)-6 = 0
(-7/4)*t-6 = 0
-7/4*t-6 = 0 // + 6
-7/4*t = 6 // : -7/4
t = 6/(-7/4)
t = -24/7
t = -24/7
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