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x in (-oo:+oo)
(2/3)*a+2 = 5*f+9 // - 5*f+9
(2/3)*a-(5*f)-9+2 = 0
(2/3)*a-5*f-9+2 = 0
2/3*a-5*f-7 = 0
x naleu017Cy do R
x in (-oo:+oo)
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