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t in (-oo:+oo)
(4/7)*t+6 = 5*t-25 // - 5*t-25
(4/7)*t-(5*t)+6+25 = 0
(4/7)*t-5*t+6+25 = 0
31-31/7*t = 0 // - 31
-31/7*t = -31 // : -31/7
t = -31/(-31/7)
t = 7
t = 7
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