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11*k = 13*t-(((7*k)/2)*t) // - 13*t-(((7*k)/2)*t)
11*k-(13*t)+((7*k)/2)*t = 0
11*k-13*t+((7*k)/2)*t = 0
11*k+7/2*k*t-13*t = 0
x należy do R
x in (-oo:+oo)
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