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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8.8/100 = 725000/x // - 725000/x
8.8/100-(725000/x) = 0
8.8/100-725000*x^-1 = 0
-725000*x^-1 = -0.088 // : -725000
x^-1 = 0.00000012
-1 < 0
1/(x^1) = 0.00000012 // * x^1
1 = 0.00000012*x^1 // : 0.00000012
8333333.33333333 = x^1
x = 8333333.33333333
x = 8333333.33333333
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