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c in (-oo:+oo)
5/6 = c/9 // - c/9
5/6-(c/9) = 0
5/6-1/9*c = 0 // - 5/6
-1/9*c = -5/6 // : -1/9
c = -5/6/(-1/9)
c = 15/2
c = 15/2
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