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t in (-oo:+oo)
(1/3)*t-5 = (3/7)*t-(319/63) // - (3/7)*t-(319/63)
(1/3)*t-((3/7)*t)+319/63-5 = 0
(1/3)*t+(-3/7)*t+319/63-5 = 0
4/63-2/21*t = 0 // - 4/63
-2/21*t = -4/63 // : -2/21
t = -4/63/(-2/21)
t = 2/3
t = 2/3
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