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