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x in (-oo:+oo)
(1/2)*f-s = (1/6)*f // - (1/6)*f
(1/2)*f-((1/6)*f)-s = 0
(1/2)*f+(-1/6)*f-s = 0
1/3*f-s = 0
x należy do R
x in (-oo:+oo)
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