To solve this question, what you would need to do is add 30 to both sides of the equation and then divide by 9, to find the solution.
You can check if it is correct by substituting the same value back into the original equation and seeing if the left hand side is equal to the right hand side.
Answer:
d + .09d
Step-by-step explanation:
9% of his salary can be found by multiplying d by 0.09. Then simply add that to his original salary to get you answer.