Multiply both sides by where is the smallest exponent of . (In other words, multiply both sides by ).
Why do you keep writing ? When you go from the line that reads
to the line that reads
, you no longer have . You subtracted from every term, so you should have
So just drop from every line. It is not true after line 5.
Next, why would you think that ?
You are giving multiple = sign in the same line without showing how you got the right side from the left side. Help us understand what you are doing by writing it. We cannot decipher what you have in mind what you write your expression the way you do. Perhaps you need to write one = sing in a line, and write a short comment next to the line telling what did you do to get from one line to the next.