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x in (-oo:+oo)
X = (1/2)*y-((1/4)*y) // - (1/2)*y-((1/4)*y)
X-((1/2)*y)+(1/4)*y = 0
X+(-1/2)*y+(1/4)*y = 0
X-1/4*y = 0
x należy do R
x in (-oo:+oo)
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