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D( C )
(2-C)/3 = 0
(2-C)/3 = 0
(2-C)/3 = 0
2-C = 0 // - 2
-C = -2 // * -1
C = 2
C in (-oo:2) U (2:+oo)
((4*C-8)/60)/((2-C)/3) = 0
(3*(4*C-8))/(60*(2-C)) = 0
( 3 )
3 = 0
C belongs to the empty set
( 4*C-8 )
4*C-8 = 0 // + 8
4*C = 8 // : 4
C = 8/4
C = 2
C in { 2}
C belongs to the empty set
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