Let's solve the equation:

$-4x + 9 + 5x = 13$

Step 1: Combine like terms

Combine the terms with $x$ on the left side:

$(-4x + 5x) + 9 = 13$ $x + 9 = 13$

Step 2: Isolate the variable $x$

Subtract 9 from both sides:

$x = 13 - 9$ $x = 4$

Thus, the solution is:

$x = 4$

Would you like further details or have any questions?

Here are 5 related questions for practice:

1. Solve: $3x - 7 + 2x = 18$
2. Solve: $6x - 4 + x = 10$
3. Solve: $2x + 5 - x = 8$
4. Solve: $-3x + 12 + 5x = 20$
5. Solve: $-7x + 10x + 6 = 15$

Tip: Always combine like terms before isolating the variable for a cleaner solution process.