If 2x + 5 = 15, what is the value of x?

To find the value of x in the equation 2x + 5 = 15, you can start by isolating the term that contains x.

First, subtract 5 from both sides of the equation. This simplifies the equation as follows:

2x + 5 - 5 = 15 - 5,

resulting in:

2x = 10.

Next, to solve for x, divide both sides by 2:

2x / 2 = 10 / 2,

which gives:

x = 5.

This result shows that the value of x is 5, confirming that the correct answer is indeed 5. This method of isolating variables is a fundamental technique in algebra for solving linear equations.