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D( c )
3*c = 0
3*c = 0
3*c = 0
3*c = 0 // : 3
c = 0
c in (-oo:0) U (0:+oo)
(c+11)/(3*c) = 4 // - 4
(c+11)/(3*c)-4 = 0
(c+11)/(3*c)+(-4*3*c)/(3*c) = 0
c-4*3*c+11 = 0
11-11*c = 0
(11-11*c)/(3*c) = 0
(11-11*c)/(3*c) = 0 // * 3*c
11-11*c = 0
11-11*c = 0 // - 11
-11*c = -11 // : -11
c = -11/(-11)
c = 1
c = 1
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