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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/10 = 18.5/x // - 18.5/x
1/10-(18.5/x) = 0
1/10-18.5*x^-1 = 0
-18.5*x^-1 = -1/10 // : -18.5
x^-1 = 0.00540541
-1 < 0
1/(x^1) = 0.00540541 // * x^1
1 = 0.00540541*x^1 // : 0.00540541
184.99984275 = x^1
x = 184.99984275
x = 184.99984275
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