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