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D( x )
3*x = 0
12*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
12*x = 0
12*x = 0
12*x = 0 // : 12
x = 0
x in (-oo:0) U (0:+oo)
(3*x)/(3*x)+(3*x)/(12*x) = 1/5 // - 1/5
(3*x)/(3*x)+(3*x)/(12*x)-(1/5) = 0
(3*x)/(12*x)+(3*x)/(3*x)-1/5 = 0
21/20 = 0
x belongs to the empty set
x belongs to the empty set
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