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x in (-oo:+oo)
D = (9*K)/K-(6*N) // - (9*K)/K-(6*N)
D+6*N-((9*K)/K) = 0
D+6*N-9 = 0
D+6*N-9 = 0
x naleu017Cy do R
x in (-oo:+oo)
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