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t in (-oo:+oo)
(-6/7)*t = -5/7 // + -5/7
(-6/7)*t-(-5/7) = 0
(-6/7)*t+5/7 = 0
5/7-6/7*t = 0 // - 5/7
-6/7*t = -5/7 // : -6/7
t = -5/7/(-6/7)
t = 5/6
t = 5/6
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