Brandy, this is the solution to the exercise:
We have that 6x + 3 = 9
6x + 3 = 9
• Subtracting 3 at both sides of the equation:
6x + 3 - 3 = 9 - 3
6x = 6
• Dividing by 6 at both sides of the equation:
6x/6 = 6/6
x = 1
In consequence, the correct answer is D. x = 1