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x in (-oo:+oo)
P = (5*d)/11+12 // - (5*d)/11+12
P-((5*d)/11)-12 = 0
P+(-5/11)*d-12 = 0
P-5/11*d-12 = 0
x naleu017Cy do R
x in (-oo:+oo)
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