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c in (-oo:+oo)
3/5 = (8/9)*c // - (8/9)*c
3/5-((8/9)*c) = 0
(-8/9)*c+3/5 = 0
3/5-8/9*c = 0 // - 3/5
-8/9*c = -3/5 // : -8/9
c = -3/5/(-8/9)
c = 27/40
c = 27/40
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