Which of the following statements describes a correct method for solving this equation
15+3x=18
A. Divide both sides of the equation by 3 and then add 15 to both sides
B. Subtract 15 from both sides of the equation and then divide both sides by 3
C. Divide both sides of the equation by 3 and then subtract 30 from both sides
D. Add 15 to both sides of the equation and then divide both sides by 3