To solve this problem, we need to determine the value of x that makes the expression $f(1 + g(2))$ equal to 5.
Let's break down the information given:
$f(x) = 2x - 3$
$g(x) = x + x$
We can substitute the expression for g(2) into the expression for f(1 + g(2)):
$f(1 + g(2)) = f(1 + (2 + x))$
$f(1 + g(2)) = f(3 + x)$
We know that this expression is equal to 5:
$f(3 + x) = 5$
Substituting the expression for f(x) into the equation, we have:
$2(3 + x) - 3 = 5$
$6 + 2x - 3 = 5$
$2x + 3 = 5$
To solve for x, we subtract 3 from both sides of the equation:
$2x + 3 - 3 = 5 - 3$
$2x = 2$
Finally, we divide both sides of the equation by 2 to solve for x:
$x = 1$
The value of x is 1.
The answer is: 1
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Let $f(x) = 2x - 3$ and $g(x) = x + X$. The value of $f(1 + g(2))$ is 5. What is the value of unknown variable X?

### Answer:
