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t in (-oo:+oo)
(5/7)*t+9 = 456/49 // - 456/49
(5/7)*t-(456/49)+9 = 0
(5/7)*t-456/49+9 = 0
5/7*t-15/49 = 0 // + 15/49
5/7*t = 15/49 // : 5/7
t = 15/49/5/7
t = 3/7
t = 3/7
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