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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
12.5/22 = 6/c // - 6/c
12.5/22-(6/c) = 0
12.5/22-6*c^-1 = 0
-6*c^-1 = -0.56818182 // : -6
c^-1 = 0.09469697
-1 < 0
1/(c^1) = 0.09469697 // * c^1
1 = 0.09469697*c^1 // : 0.09469697
10.55999997 = c^1
c = 10.55999997
c = 10.55999997
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