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D( c )
c+6 = 0
6-c = 0
c+6 = 0
c+6 = 0
c+6 = 0 // - 6
c = -6
6-c = 0
6-c = 0
6-c = 0 // - 6
-c = -6 // * -1
c = 6
c in (-oo:-6) U (-6:6) U (6:+oo)
20/(6-c) = 28/(c+6) // - 28/(c+6)
20/(6-c)-(28/(c+6)) = 0
20/(6-c)-28*(c+6)^-1 = 0
20/(6-c)-28/(c+6) = 0
(20*(c+6))/((6-c)*(c+6))+(-28*(6-c))/((6-c)*(c+6)) = 0
20*(c+6)-28*(6-c) = 0
48*c-48 = 0
(48*c-48)/((6-c)*(c+6)) = 0
(48*c-48)/((6-c)*(c+6)) = 0 // * (6-c)*(c+6)
48*c-48 = 0
48*c-48 = 0 // + 48
48*c = 48 // : 48
c = 48/48
c = 1
c = 1
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