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x in (-oo:+oo)
Z-(4/12) = (z/2)/10 // - (z/2)/10
Z-((z/2)/10)-(4/12) = 0
Z+(-1/20)*z-1/3 = 0
Z-1/20*z-1/3 = 0
x należy do R
x in (-oo:+oo)
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