I want solve equation group below, but you can see the result return a {}, but when i reduce the equation group like this , it can give a solution(Seeing in the image), why is this ?
Please put your code in code blocks, not as images. Code blocks allow other members to copy and paste your code into Mathematica. You can find out how to do that, and many more useful things, by reading How to post.
you have two Delta_l1
Attachments:
