-5x^2+10+x-x^2

To simplify the expression -5x^2 + 10 + x - x^2, we can combine like terms:

-5x^2 - x^2 + x + 10

Now, we can combine the x^2 terms:

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

Simplifying further:

-6x^2 + x + 10

So, the simplified expression is -6x^2 + x + 10.