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C in (-oo:+oo)
8/9 = C/3 // - C/3
8/9-(C/3) = 0
8/9-1/3*C = 0 // - 8/9
-1/3*C = -8/9 // : -1/3
C = -8/9/(-1/3)
C = 8/3
C = 8/3
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