To simplify the expression, first combine like terms:

5/x - 7 - 2/x - 3x + 28/x^2 - 49

Combine the terms with x in the denominator:

(5-2)/x - 7 - 3x + 28/x^2 - 49
3/x - 7 - 3x + 28/x^2 - 49

Now combine the constants:

3/x - 3x + 28/x^2 - 56

Now, to combine the terms, find a common denominator for the fractions:

3/x = 3x/xx
56 = 56x^2/xx

Now, combine the terms:

(3x^2 - 3x(x) + 28 - 56x^2)/(xx)
(3x^2 - 3x^2 + 28 - 56x^2)/(xx)
(-53x^2 + 28)/(x^2)

Therefore, the simplified expression is (-53x^2 + 28)/(x^2)