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C in (-oo:+oo)
C/3 = 0.3 // - 0.3
C/3-0.3 = 0
1/3*C-0.3 = 0 // + 0.3
1/3*C = 0.3 // : 1/3
C = 0.3/1/3
C = 0.90000001
C = 0.90000001
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