P=125,25;24,5+45,5+x,x=

To find the value of \( x \) in the equation \( P = 125.25; 24.5 + 45.5 + x \), we need to clarify the format of the equation.

It seems like you've used a semicolon in the equation, which is unusual. If we interpret it as:

\[ P = 125.25 + 24.5 + 45.5 + x \]

We can rearrange the equation to solve for \( x \):

1. First, combine the known numbers: \[ 24.5 + 45.5 = 70 \]

2. Now, substitute that back into the equation: \[ P = 125.25 + 70 + x \]

3. So, \[ P = 195.25 + x \]

4. If you want to isolate \( x \): \[ x = P - 195.25 \]

If you have a specific value for \( P \), insert it into the equation to find \( x \). Otherwise, without a predefined value of \( P \), \( x \) remains as \( P - 195.25 \).

If you meant something different with the semicolon, please provide more context!