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t in (-oo:+oo)
t/(-7) = -2/3 // + -2/3
t/(-7)-(-2/3) = 0
t/(-7)+2/3 = 0
2/3-1/7*t = 0 // - 2/3
-1/7*t = -2/3 // : -1/7
t = -2/3/(-1/7)
t = 14/3
t = 14/3
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