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x in (-oo:+oo)
C = (5/9)*(f-2) // - (5/9)*(f-2)
C-((5/9)*(f-2)) = 0
(-5/9)*(f-2)+C = 0
C-5/9*(f-2) = 0
C-5/9*(f-2) = 0
C-5/9*f+10/9 = 0
C-5/9*f+10/9 = 0
x belongs to the empty set
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