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C in (-oo:+oo)
C/2 = 1/19 // - 1/19
C/2-(1/19) = 0
C/2-1/19 = 0
1/2*C-1/19 = 0 // + 1/19
1/2*C = 1/19 // : 1/2
C = 1/19/1/2
C = 2/19
C = 2/19
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