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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
2/c+3 = -5/c-1 // + -5/c-1
2/c-(-5/c)+1+3 = 0
2/c+5*c^-1+1+3 = 0
7*c^-1 = -4 // : 7
c^-1 = -4/7
-1 < 0
1/(c^1) = -4/7 // * c^1
1 = -4/7*c^1 // : -4/7
-7/4 = c^1
c = -7/4
c = -7/4
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