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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
how do you solve the 3 equations? what method?
I disagree, mathematics is not very difficult, the level of high school is approximately, quite pulling on 6 kyu. But the kata itself is boring - just a mathematical problem from some school test, where 8 kyu programming plays only the role of a calculator.
Others may think differently.