Windows 10: adding variables

PHP - I need to add "a1" to "a2" to "a3" then that total becomes "sum"

 

System environment variable won't stick

Running Win10 Home on an Acer Spin 3, 64bit, i7cpu. I try to add a path to the system environment variables by:

1. Control Panel > System > Advanced system settings > Advanced tab > Environment variables

2. The "Environment Variables" window opens.
3. In the "System Variables" pane I select "Path" and click the EDIT button.
4. A list of the current system paths is displayed.
5. I click the NEW button, browse to the path I want to add which is "C:\Python36-32" and click OK. The path "C:\Python36-32" is added to the list of current system paths.
6. I click OK and am returned to the "Environment Variables" window.
7. I click the "X" at the top right to close the "Environment Variables" window.

Now if I click the "Environment Variables" button again (end of step-1) and repeat steps 2-4, the new path I added in step-5 is gone. IOW, adding a new path won't stick.

What am I doing wrong?

 

Enviromnent Variables - adding to system path

I am trying to add in the environment Variable to path the following path address C:\Program Files (x86)\CodeBlocks\MinGW\bin

I have also added this address to user variables ( the top box)

I am have also added this location to the system path so the MinGW compiler (C programming) can work in any directory

I found the path in the system variable environment added the above address (bottom box) at the end but I am still am unable to perform in any directory gcc simpleAge.c unless I use the full directory this file is in.

 

Searching environment variable in list

I'm using a command that gives me a list of environment variables. When searching in the list, I want to find all environment variables with the word
EXTERNAL; using the following command all that is occurring is all the environment variables are being listed instead of those environment variables with the word
EXTERNAL ?

findstr /c "EXTERNAL"