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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.5/288 = 6.5/x // - 6.5/x
2.5/288-(6.5/x) = 0
2.5/288-6.5*x^-1 = 0
-6.5*x^-1 = -0.00868056 // : -6.5
x^-1 = 0.00133547
-1 < 0
1/(x^1) = 0.00133547 // * x^1
1 = 0.00133547*x^1 // : 0.00133547
748.80004792 = x^1
x = 748.80004792
x = 748.80004792
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