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x in (-oo:+oo)
Z/z-7.5 = 12.5/10 // - 12.5/10
Z/z-(12.5/10)-7.5 = 0
Z/z-7.5-1.25 = 0
Z*z^-1-8.75 = 0
x należy do R
x in (-oo:+oo)
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