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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
16/c+17 = 5 // - 5
16/c-5+17 = 0
16*c^-1 = -12 // : 16
c^-1 = -3/4
-1 < 0
1/(c^1) = -3/4 // * c^1
1 = -3/4*c^1 // : -3/4
-4/3 = c^1
c = -4/3
c = -4/3
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