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c in (-oo:+oo)
(5/9)*c-((2/3)*c) = 1 // - 1
(5/9)*c-((2/3)*c)-1 = 0
(5/9)*c+(-2/3)*c-1 = 0
-1/9*c-1 = 0 // + 1
-1/9*c = 1 // : -1/9
c = 1/(-1/9)
c = -9
c = -9
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