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x in (-oo:+oo)
(7*t)/k-9 = 8/k-(13*t) // - 8/k-(13*t)
(7*t)/k-(8/k)+13*t-9 = 0
(7*t)/k-8*k^-1+13*t-9 = 0
13*t-8*k^-1+7*k^-1*t-9 = 0
x należy do R
x in (-oo:+oo)
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