So I know more about your current knowledge, can you answer these questions? What is x if x+5=13? What is x if x times 5 = 13? What is x if x+13=5? What is

So I know more about your current knowledge, can you answer these questions? What is x if x+5=13? What is x if x times 5 = 13? What is x if x+13=5? What is -23 times 7? What is -5 times -14? You probably find those completely trivial, I know. Can you give me an example of the sort of question you would find more challenging? And I'm serious. If you're serious, knowing how you answer these questions means a lot. The other thing is - what do you think mathematics is? I'm not yet sure what you think you want to learn. Can you tell me more?