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t in (-oo:+oo)
6 = (4/(-7))*t // - (4/(-7))*t
6-((4/(-7))*t) = 0
(4/7)*t+6 = 0
4/7*t+6 = 0 // - 6
4/7*t = -6 // : 4/7
t = -6/4/7
t = -21/2
t = -21/2
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