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D( x )
0.1-x = 0
0.1-x = 0
0.1-x = 0
0.1-x = 0 // - 0.1
-x = -0.1 // * -1
x = 0.1
x in (-oo:0.1) U (0.1:+oo)
49 = (x/(0.1-x))*(0.1-x) // - (x/(0.1-x))*(0.1-x)
49-((x/(0.1-x))*(0.1-x)) = 0
49-x = 0
49-x = 0 // - 49
-x = -49 // * -1
x = 49
x = 49
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