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Has anyone successfully solved the problem of obtaining empty pfb folder even after following all the steps? I am unable to see any files in this folder. Kindly help if you can.

Thank you pointing out areas where I can improve on submitting my queries. I accept these points. I have also learned something and improvised my code. I will submit a minimal working example or similar in coming days but not today since I have to submit the assignment tomorrow. I will try to work ...

I have incorporated the suggestions you have told. But still there are some problems which I am facing.
1. When I am inserting any text, then all the formulas move towards right side and hence they are not in line with formula written on previous page (whose code I have given above).
2. How do I ...

Thanks for reply firstly.
Given below is the complete code after modifications. But after running it, I see Badbox-Line 64 overfull\hbox(66.12054 pt too wide) in para at line64--64. Is there any problem given that I am going to add 1 more of formulas?
\documentclass[12pt,a4paper,fleqn]{article ...

Hi,
I am using Texmaker on windows 8 and I have TexLive 2013 installed. I am preparing an assignment in which I have to write some formulas and then substitute them with suitable number and then arrive on final value of the unknown. Unfortunately, all the formulas are centered. Hence if I want to ...