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x in (-oo:+oo)
F/2-f-(2/4) = 9/4 // - 9/4
F/2-f-(2/4)-(9/4) = 0
F/2-f-1/2-9/4 = 0
1/2*F-f-11/4 = 0
x należy do R
x in (-oo:+oo)
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