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