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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x+4)/2-((3*x)/x)+2 = x // - x
(2*x+4)/2-x-((3*x)/x)+2 = 0
(2*x+4)/2-x-3+2 = 0
(2*x+4)/2+(2*(-x))/2+(-3*2)/2+(2^2)/2 = 0
2*x+2*(-x)-3*2+4+4 = 0
4-6+4 = 0
4-2 = 0
2 = 0
2/2 = 0
2/2 = 0 // * 2
2 = 0
x belongs to the empty set
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