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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
190/360 = 662.89/x // - 662.89/x
190/360-(662.89/x) = 0
190/360-662.89*x^-1 = 0
-662.89*x^-1 = -19/36 // : -662.89
x^-1 = 0.00079618
-1 < 0
1/(x^1) = 0.00079618 // * x^1
1 = 0.00079618*x^1 // : 0.00079618
1255.99738753 = x^1
x = 1255.99738753
x = 1255.99738753
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