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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
4/32 = 10.5/c // - 10.5/c
4/32-(10.5/c) = 0
4/32-10.5*c^-1 = 0
-10.5*c^-1 = -1/8 // : -10.5
c^-1 = 0.01190476
-1 < 0
1/(c^1) = 0.01190476 // * c^1
1 = 0.01190476*c^1 // : 0.01190476
84.00001344 = c^1
c = 84.00001344
c = 84.00001344
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