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c in (-oo:+oo)
5/9 = c/57 // - c/57
5/9-(c/57) = 0
5/9-1/57*c = 0 // - 5/9
-1/57*c = -5/9 // : -1/57
c = -5/9/(-1/57)
c = 95/3
c = 95/3
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