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C in (-oo:+oo)
C/7 = 2.9 // - 2.9
C/7-2.9 = 0
1/7*C-2.9 = 0 // + 2.9
1/7*C = 2.9 // : 1/7
C = 2.9/1/7
C = 20.30000041
C = 20.30000041
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