Simplify the given algebraic expression.
\[
6 x+9 x
\]
\[
6 x+9 x=
\]

Answer

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Answer

Final Answer: \(\boxed{15x}\)

Steps

Step 1 ：The given expression is \(6x + 9x\).

Step 2 ：These are similar terms, meaning they have the same variable part.

Step 3 ：In such cases, we can simply add the coefficients of the similar terms to simplify the expression.

Step 4 ：The coefficient of the first term is 6 and the coefficient of the second term is 9.

Step 5 ：Adding these coefficients together gives us 15.

Step 6 ：Therefore, the simplified form of the given expression is \(15x\).

Step 7 ：Final Answer: \(\boxed{15x}\)