Solve the linear equation.
\[
6 x+9=4 x+45
\]
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A. The solution set is (Type an integer or a simplified fraction.)

B. The solution set is $\{x \mid x$ is a real number $\}$.
C. The solution set is $\varnothing$.
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Answer

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Answer

Final Answer: The solution set is $\boxed{18}$.

Steps

Step 1 ：Subtract 4x from both sides of the equation to get $2x + 9 = 45$.

Step 2 ：Subtract 9 from both sides to get $2x = 36$.

Step 3 ：Divide both sides by 2 to solve for x, so the solution is $x = 18$.

Step 4 ：Final Answer: The solution set is $\boxed{18}$.