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x in (-oo:+oo)
R/4-(r/14) = 1/4 // - 1/4
R/4-(r/14)-(1/4) = 0
R/4-(r/14)-1/4 = 0
1/4*R-1/14*r-1/4 = 0
x należy do R
x in (-oo:+oo)
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