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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x+10*y)^2)/x = 0
x+10*y = 0 // - 10*y
x = -(10*y)
x = -10*y
x in { -10*y, -10*y }
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