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D( x )
2*b+2*s = 0
2*b-(2*s) = 0
2*b+2*s = 0
2*b+2*s = 0
2*b+2*s = 0
x naleu017Cy do R
2*b-(2*s) = 0
2*b-(2*s) = 0
2*b-2*s = 0
2*b-2*s = 0
x naleu017Cy do R
x belongs to the empty set
1/(2*b+2*s)-(1/(2*b-(2*s))) = 0
x belongs to the empty set
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