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