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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-3.5 = y-(0.75/y) // - y-(0.75/y)
0.75/y-y+x/x-3.5 = 0
0.75*y^-1-y-2.5 = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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