(–7x2+6x)–(–x2–3x–10).

Sure, let's solve this step by step:

1. First, let's simplify the expression by removing the parentheses. Remember that when you have a negative sign in front of a parenthesis, you need to change the sign of each term inside the parenthesis. So, the expression becomes:

   -7x^2 + 6x + x^2 + 3x + 10

2. Next, let's combine like terms:

   (-7x^2 + x^2) + (6x + 3x) + 10

3. This simplifies to:

   -6x^2 + 9x + 10

So, the simplified form of the expression "(–7x^2+6x)–(–x^2–3x–10)" is "-6x^2 + 9x + 10".