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t in (-oo:+oo)
(6/7)*t-7 = -6*t-(461/35) // + -6*t-(461/35)
(6/7)*t-(-6*t)+461/35-7 = 0
(6/7)*t+6*t+461/35-7 = 0
48/7*t+216/35 = 0 // - 216/35
48/7*t = -216/35 // : 48/7
t = -216/35/48/7
t = -9/10
t = -9/10
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