simplify by combining like terms.\nfirst, add together the coefficients for u.\n3u + 9x + 6u +…

simplify by combining like terms.\nfirst, add together the coefficients for u.\n3u + 9x + 6u + 2x\ncombine\n?u + x\nenter the number that goes in the green box.
Answer
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