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x in (-oo:+oo)
R-2 = (1/4)*r-(1/2) // - (1/4)*r-(1/2)
R-((1/4)*r)+1/2-2 = 0
R+(-1/4)*r+1/2-2 = 0
R-1/4*r-3/2 = 0
x należy do R
x in (-oo:+oo)
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