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x in (-oo:+oo)
2*r = (5*s)/2-(s/4) // - (5*s)/2-(s/4)
2*r-((5*s)/2)+s/4 = 0
2*r+(-5/2)*s+s/4 = 0
2*r-9/4*s = 0
x należy do R
x in (-oo:+oo)
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