Solve 3 equations in three unknowns I, W, and L

[cytp450]

Homework Statement

Solve 3 equations in three unknowns I, W, and L to find the critical value of L.

***Please See attachment 'differential.gif'****

also note, that I wrote all this using 'mathtype', if its of importance for any to know.

Homework Equations

Please see attachment 'differential.gif'

The Attempt at a Solution

****Please see attachment 'Differential tryout.gif' and 'Differential Tryout2.gif'***

I squeezed my brain to what it can handle, but I can not understand how the textbook has got such a solution by its process which I do not understand------Please see attachment 'Differential textSolution.gif' ( since their is a max of three attachments, I am gona make a new thread named 'Differential Text sol' with the attachment.

 

[cytp450]

Differential text sol

Homework Statement

see attachment in thread 'differential'

Homework Equations

See attachment in thread 'Differential'

The Attempt at a Solution

this has the text solution, which i do not understand how it got it?. Please see attachment "Differential text solution.gif'