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x in (-oo:+oo)
(1/9)*(5*f-160) = c // - c
(1/9)*(5*f-160)-c = 0
1/9*(5*f-160)-c = 0
1/9*(5*f-160)-c = 0
5/9*f-c-160/9 = 0
5/9*f-c-160/9 = 0
x belongs to the empty set
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