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D( C )
C = 0
C = 0
C = 0
C in (-oo:0) U (0:+oo)
-35/C = -5 // + 5
5-35/C = 0
-35*C^-1 = -5 // : -35
C^-1 = 1/7
-1 < 0
1/(C^1) = 1/7 // * C^1
1 = 1/7*C^1 // : 1/7
7 = C^1
C = 7
C = 7
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