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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1.8*42.1)/x = (2.8*35.5)/288 // - (2.8*35.5)/288
(1.8*42.1)/x-((2.8*35.5)/288) = 0
(1.8*42.1)/x-0.34513889 = 0
75.78*x^-1 = 0.34513889 // : 75.78
x^-1 = 0.00455449
-1 < 0
1/(x^1) = 0.00455449 // * x^1
1 = 0.00455449*x^1 // : 0.00455449
219.56355157 = x^1
x = 219.56355157
x = 219.56355157
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