If 3x + 6 = 51, then x =

B. 15

Explanation

To find the answer to this question, we must “solve for x,” which simply means getting x all alone on one side of the equation, and everything else on the other side. The x is already on the left-hand side of the equals sign in this equation, so let’s try to move the other numbers on the left side over to the right side: 3x = 45, and x = 45/3. Finally, we have x = 15.

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