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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
7/12 = 36/c // - 36/c
7/12-(36/c) = 0
7/12-36*c^-1 = 0
-36*c^-1 = -7/12 // : -36
c^-1 = 7/432
-1 < 0
1/(c^1) = 7/432 // * c^1
1 = 7/432*c^1 // : 7/432
432/7 = c^1
c = 432/7
c = 432/7
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