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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
616/c = 22 // - 22
616/c-22 = 0
616*c^-1 = 22 // : 616
c^-1 = 1/28
-1 < 0
1/(c^1) = 1/28 // * c^1
1 = 1/28*c^1 // : 1/28
28 = c^1
c = 28
c = 28
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