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x in (-oo:+oo)
((d/15)*k)/8 = 14/4 // - 14/4
((d/15)*k)/8-(14/4) = 0
((d/15)*k)/8-7/2 = 0
1/120*d*k-7/2 = 0
x należy do R
x in (-oo:+oo)
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