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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9.8 = (10*x)/x+5/1 // - (10*x)/x+5/1
9.8-((10*x)/x)-(5/1) = 0
9.8-10-5 = 0
-5.2 = 0
x belongs to the empty set
x belongs to the empty set
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