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D( x )
2*x+10 = 0
2*x+10 = 0
2*x+10 = 0
2*x+10 = 0 // - 10
2*x = -10 // : 2
x = -10/2
x = -5
x in (-oo:-5) U (-5:+oo)
1/(2*x+10) = 0
x belongs to the empty set
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