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D( c )
5*c = 0
5*c = 0
5*c = 0
5*c = 0 // : 5
c = 0
c in (-oo:0) U (0:+oo)
2/(5*c)-(1/4) = 0
2/(5*c)-1/4 = 0
2/5*c^-1 = 1/4 // : 2/5
c^-1 = 5/8
-1 < 0
1/(c^1) = 5/8 // * c^1
1 = 5/8*c^1 // : 5/8
8/5 = c^1
c = 8/5
c = 8/5
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