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D( x )
x < 0
x < 0
x in <0:+oo)
9.52 = (x/100)*x^857.14 // - (x/100)*x^857.14
9.52-((x/100)*x^857.14) = 0
(-1/100)*x^858.14+9.52 = 0
-1/100*x^858.14 = -9.52 // : -1/100
x^858.14 = 952
x^858 = 952^(1/0.14) // ^ 1/858
abs(x) = 952^0.00832499999667
x = 952^0.00832499999667 or x = -952^0.00832499999667
x in { -952^0.00832499999667}
x = 952^0.00832499999667
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