The sum of three numbers is 45. The second of the three numbers is three more than twice the first number, x. The third number is two more than the first number, x. Which equation can be used to solve for the first number, x?

The first number is x. The second is three more than twice the first, or 2x + 3, and the third is two more than the first, or x + 2. Adding the three numbers gives x + 2x + 3 + x + 2 = 45, which is choice D.

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