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t in (-oo:+oo)
(6/7)*t+4/5 = -122/35 // + -122/35
(6/7)*t+4/5-(-122/35) = 0
(6/7)*t+4/5+122/35 = 0
6/7*t+30/7 = 0 // - 30/7
6/7*t = -30/7 // : 6/7
t = -30/7/6/7
t = -5
t = -5
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