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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
7/12 = 35/c // - 35/c
7/12-(35/c) = 0
7/12-35*c^-1 = 0
-35*c^-1 = -7/12 // : -35
c^-1 = 1/60
-1 < 0
1/(c^1) = 1/60 // * c^1
1 = 1/60*c^1 // : 1/60
60 = c^1
c = 60
c = 60
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