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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*(x-1)+(3*x)/x-0.4 = x // - x
2*(x-1)-x+(3*x)/x-0.4 = 0
2*(x-1)-x-0.4+3 = 0
2*(x-1)-x-0.4+3 = 0
x-2-0.4+3 = 0
x-0.4+1 = 0
x+0.6 = 0
x+0.6 = 0
x+0.6 = 0 // - 0.6
x = -0.6
x = -0.6
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