Prime and Composite Possibilities

Let \(x\) be a positive integer which can be written as \(a \times b\), where \(a\) and \(b\) are primes (positive). We define \(x_$=ab\left(1-\frac{1}{a}\right)\left(1-\frac{1}{b}\right)\). Find the sum of all possible values of \(x\) such that \(x_$=600\)

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