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t in (-oo:+oo)
t/(-7) = 4/7 // - 4/7
t/(-7)-(4/7) = 0
t/(-7)-4/7 = 0
-1/7*t-4/7 = 0 // + 4/7
-1/7*t = 4/7 // : -1/7
t = 4/7/(-1/7)
t = -4
t = -4
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