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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
10/c+2 = 3/4 // - 3/4
10/c-(3/4)+2 = 0
10/c-3/4+2 = 0
10*c^-1 = -5/4 // : 10
c^-1 = -1/8
-1 < 0
1/(c^1) = -1/8 // * c^1
1 = -1/8*c^1 // : -1/8
-8 = c^1
c = -8
c = -8
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