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t in (-oo:+oo)
t/4+t/3 = 7/13 // - 7/13
t/4+t/3-(7/13) = 0
t/4+t/3-7/13 = 0
7/12*t-7/13 = 0 // + 7/13
7/12*t = 7/13 // : 7/12
t = 7/13/7/12
t = 12/13
t = 12/13
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