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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
43/x = 18/100 // - 18/100
43/x-(18/100) = 0
43/x-9/50 = 0
43*x^-1 = 9/50 // : 43
x^-1 = 9/2150
-1 < 0
1/(x^1) = 9/2150 // * x^1
1 = 9/2150*x^1 // : 9/2150
2150/9 = x^1
x = 2150/9
x = 2150/9
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