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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
9/22 = 54/c // - 54/c
9/22-(54/c) = 0
9/22-54*c^-1 = 0
-54*c^-1 = -9/22 // : -54
c^-1 = 1/132
-1 < 0
1/(c^1) = 1/132 // * c^1
1 = 1/132*c^1 // : 1/132
132 = c^1
c = 132
c = 132
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