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x in (-oo:+oo)
N = (2/9)*P+1 // - (2/9)*P+1
N-((2/9)*P)-1 = 0
N+(-2/9)*P-1 = 0
N-2/9*P-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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