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x in (-oo:+oo)
P = (7*d)/9+14 // - (7*d)/9+14
P-((7*d)/9)-14 = 0
P+(-7/9)*d-14 = 0
P-7/9*d-14 = 0
x naleu017Cy do R
x in (-oo:+oo)
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