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x in (-oo:+oo)
Q = (1/2)*P+15 // - (1/2)*P+15
Q-((1/2)*P)-15 = 0
(-1/2)*P+Q-15 = 0
Q-1/2*P-15 = 0
x naleu017Cy do R
x in (-oo:+oo)
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