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x in (-oo:+oo)
F-(9/(-3)) = 11-(f/5) // - 11-(f/5)
F+f/5-(9/(-3))-11 = 0
F+f/5-11+3 = 0
F+1/5*f-8 = 0
x naleu017Cy do R
x in (-oo:+oo)
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