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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
4.75/c = 570 // - 570
4.75/c-570 = 0
4.75*c^-1 = 570 // : 4.75
c^-1 = 120
-1 < 0
1/(c^1) = 120 // * c^1
1 = 120*c^1 // : 120
1/120 = c^1
c = 1/120
c = 1/120
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