To simplify the expression 10/25 - x^2 - 1/5 + x - x/(x-5), we need to find a common denominator for the fractions. In this case, the common denominator is 25.

Therefore, we rewrite the expression as:

(10/25) - x^2 - (1/5) + (5x/25) - (x/25)

Now, we combine the terms with the same denominator:

(10 - 1) / 25 - x^2 + 4x / 25 - x / 25

Simplify the expression further to get:

9 / 25 - x^2 + 4x / 25 - x / 25

Now, combine the fractions:

(9 - x^2 + 4x - x) / 25

This simplifies to:

(9 - x^2 + 3x) / 25

Therefore, the simplified expression is (9 - x^2 + 3x) / 25.