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D( x )
0.15-x = 0
0.15-x = 0
0.15-x = 0
0.15-x = 0 // - 0.15
-x = -0.15 // * -1
x = 0.15
x in (-oo:0.15) U (0.15:+oo)
x/(0.15-x) = 0
x = 0
x = 0
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