Question

simplify by combining like terms.
first, add together the coefficients for u.
3u + 9x + 6u + 2x
combine
?u + x
enter the number that goes in the green box.

Explanation:

Step1: Identify like terms for u

The terms with \( u \) are \( 3u \) and \( 6u \).

Step2: Combine coefficients of u

To combine them, add their coefficients: \( 3 + 6 = 9 \). So the coefficient for \( u \) is 9.

Answer:

9