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C in (-oo:+oo)
C/4 = 2.93 // - 2.93
C/4-2.93 = 0
1/4*C-2.93 = 0 // + 2.93
1/4*C = 2.93 // : 1/4
C = 2.93/1/4
C = 11.72
C = 11.72
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