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t in (-oo:+oo)
6/13-t = 5/13 // - 5/13
6/13-t-(5/13) = 0
6/13-t-5/13 = 0
1/13-t = 0 // - 1/13
-t = -1/13 // * -1
t = 1/13
t = 1/13
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