What type of solution Lingo gives? Is it numerical?
There is a great FAQ section located at the developer's website, make sure to check it.
Yes, I think Lingo offers a numerical solution. Now there are a lot of different resources that can help in various calculus and in solving mathematical problems or equations. I often use the resource https://plainmath.net/post-secondary/calculus-and-analysis/differential-calculus/limits-and-continuity where I find answers to my questions that relate to various aspects of mathematical calculations. For example, on this page you can find information and help with constraints and continuity in differential calculations.