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x in (-oo:+oo)
C = 11*X+90000/X // - 11*X+90000/X
C-(11*X)-(90000/X) = 0
C-11*X-90000*X^-1 = 0
C-11*X-90000*X^-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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