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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/50 = 8.75/x // - 8.75/x
1/50-(8.75/x) = 0
1/50-8.75*x^-1 = 0
-8.75*x^-1 = -1/50 // : -8.75
x^-1 = 0.00228571
-1 < 0
1/(x^1) = 0.00228571 // * x^1
1 = 0.00228571*x^1 // : 0.00228571
437.50082031 = x^1
x = 437.50082031
x = 437.50082031
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