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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
180*(1.8/x) = 180*(1.6/100) // - 180*(1.6/100)
180*(1.8/x)-(180*(1.6/100)) = 0
180*(1.8/x)-72/25 = 0
324*x^-1 = 72/25 // : 324
x^-1 = 2/225
-1 < 0
1/(x^1) = 2/225 // * x^1
1 = 2/225*x^1 // : 2/225
225/2 = x^1
x = 225/2
x = 225/2
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