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x in (-oo:+oo)
0.75*(R/2) = 1.25*(r/2) // - 1.25*(r/2)
0.75*(R/2)-(1.25*(r/2)) = 0
0.75*(R/2)-0.625*r = 0
0.375*R-0.625*r = 0
x należy do R
x in (-oo:+oo)
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