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t in (-oo:+oo)
(13*t)/42-(t/7) = 1 // - 1
(13*t)/42-(t/7)-1 = 0
1/6*t-1 = 0 // + 1
1/6*t = 1 // : 1/6
t = 1/1/6
t = 6
t = 6
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