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x in (-oo:+oo)
P^1 = C^2+(F^2)/160-P^1 // - C^2+(F^2)/160-P^1
P^1-C^2-((F^2)/160)+P^1 = 0
P-C^2-((F^2)/160)+P = 0
2*P-C^2-1/160*F^2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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