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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
10/c = 150/200 // - 150/200
10/c-(150/200) = 0
10/c-3/4 = 0
10*c^-1 = 3/4 // : 10
c^-1 = 3/40
-1 < 0
1/(c^1) = 3/40 // * c^1
1 = 3/40*c^1 // : 3/40
40/3 = c^1
c = 40/3
c = 40/3
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