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t in (-oo:+oo)
(4/7)*t+3 = 4*t+9/35 // - 4*t+9/35
(4/7)*t-(4*t)-(9/35)+3 = 0
(4/7)*t-4*t-9/35+3 = 0
96/35-24/7*t = 0 // - 96/35
-24/7*t = -96/35 // : -24/7
t = -96/35/(-24/7)
t = 4/5
t = 4/5
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