collect the like terms and simplify:
`5x^(2) - 2x + 7 - 9 + 7x - 3x^(2) + 4x^(2) - x - 1`

Explanation

To solve the expression \(5x^{2} - 2x + 7 - 9 + 7x - 3x^{2} + 4x^{2} - x - 1\), we will collect the like terms and simplify step by step.

### Step 1: Write down the expression
We start with the expression:
\[ 5x^{2} - 2x + 7 - 9 + 7x - 3x^{2} + 4x^{2} - x - 1 \]

### Step 2: Identify and group like terms
Now, we will group the like terms together:
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