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t in (-oo:+oo)
3*t = 6/13 // - 6/13
3*t-(6/13) = 0
3*t-6/13 = 0
3*t-6/13 = 0 // + 6/13
3*t = 6/13 // : 3
t = 6/13/3
t = 2/13
t = 2/13
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