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x in (-oo:+oo)
3*t = (7*k)/13-17 // - (7*k)/13-17
3*t-((7*k)/13)+17 = 0
(-7/13)*k+3*t+17 = 0
3*t-7/13*k+17 = 0
x należy do R
x in (-oo:+oo)
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