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