Okay, so for the first part; just to make sure you understand what is happening, and why x = -4;
When making x the subject, or solving for x you will do the following;
Get all the x-terms on one side (for example the left side) and all the free numbers on the other side (for example the right side). This you do as following;
Moving the x-terms;
5x + 4 = x - 12
Subtract x from both sides
5x - x + 4 = x - x - 12
Here you see that the x on the right hand side cancels out;
4x + 4 = - 12
Now, subtract 4 from both sides to move 4 from the left to the right side;
4x + 4 - 4 = - 12 - 4
The 4 cancels out on the left hand side, and you get
4x = - 16
Now you can divide with 4 on both sides to get the four away from the left hand side;
4x/4 = - 16/4
The 4 cancels out on the left hand side and you get;
x = - 4
Now, for the next question it seems like you just have to construct a function like this. It requires a bit imagination, but I can give you one where x = 3, and then you can try to solve it! (and don't worry, I will try to make it easy!)
4x + 2 = 8 + 2x
Now, try to solve that one and see what you get! And remember, there are infinitely many functions where x = 3. I am just giving you one.
Hope this helped! Sorry for the bad notation
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