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x in (-oo:+oo)
J-6 = (1/2)*j-3 // - (1/2)*j-3
J-((1/2)*j)-6+3 = 0
J+(-1/2)*j-6+3 = 0
J-1/2*j-3 = 0
x należy do R
x in (-oo:+oo)
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