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t in (-oo:+oo)
t/9 = 7/39 // - 7/39
t/9-(7/39) = 0
t/9-7/39 = 0
1/9*t-7/39 = 0 // + 7/39
1/9*t = 7/39 // : 1/9
t = 7/39/1/9
t = 21/13
t = 21/13
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