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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20-(x/x) = x // - x
20-x-(x/x) = 0
20-x-1 = 0
19-x = 0 // - 19
-x = -19 // * -1
x = 19
x = 19
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