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