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C in (-oo:+oo)
C/9 = 4/15 // - 4/15
C/9-(4/15) = 0
C/9-4/15 = 0
1/9*C-4/15 = 0 // + 4/15
1/9*C = 4/15 // : 1/9
C = 4/15/1/9
C = 12/5
C = 12/5
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