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C in (-oo:+oo)
C/2.3 = 8.7 // - 8.7
C/2.3-8.7 = 0
0.43478261*C-8.7 = 0 // + 8.7
0.43478261*C = 8.7 // : 0.43478261
C = 8.7/0.43478261
C = 20.00999994
C = 20.00999994
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