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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x+3*x+2*x+x/x = 0
9*x+1 = 0 // - 1
9*x = -1 // : 9
x = -1/9
x = -1/9
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