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t in (-oo:+oo)
7*t+(2/3)*t-(5/7) = 962/231 // - 962/231
7*t+(2/3)*t-(5/7)-(962/231) = 0
7*t+(2/3)*t-5/7-962/231 = 0
23/3*t-161/33 = 0 // + 161/33
23/3*t = 161/33 // : 23/3
t = 161/33/23/3
t = 7/11
t = 7/11
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