Think about the notion of language : we live in language and use it as a tool of communication. So the meaning of language is manyfold, as is the notion of mathematics. It serves as a language in for instance the field of physics, but also as a tool in order to solve problems.
Mathematics is a tool used in machine learning techniques (e.g., Gaussian, Poisson law, linear function) to understand or predict phenomena and R, Python or others were code languages.
When we speak specifically of mathematics an equation can be considered as a language.
An equation can be considered as a sentence in the language of mathematics, at least in its formalized version as can be seen in every book about mathematical logic or ZFC set theory. Programming languages are also formalized languages, and you have to stick to these formalizations in order for a computer to work correctly. However, most mathematicians use a semi formal mathematical language, but when for instance a theorem is correct, meaning that is has a correct proof, then one can write theorem and proof in the formalized language of mathematics, but the result is almost always unreadable by a human being, but " understandable " by a formal proof system, that can be implemented on a computer. In this sense one can let computers prove theorems, but then it needs a lot of input from a human being. But doing mathematics is also an art, and in order to be able to practice this art one needs a lot of practice and mathematical knowledge.
A Gaussian law is a concept in statistics or probability theory. The notion of linear function belongs to the areas of calculus , analysis and linear algebra.