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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x+3/x+2+4 = 8/x+6 // - 8/x+6
5/x+3/x-(8/x)-6+2+4 = 0
5/x+3/x-8*x^-1-6+2+4 = 0
0 = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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