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D( x )
4*x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/(4*x)-x = 12 // - 12
(2*x)/(4*x)-x-12 = 0
-x-23/2 = 0 // + 23/2
-x = 23/2 // * -1
x = -23/2
x = -23/2
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