## Solving Equations and Writing Expressions with SymPy and Python

**SymPy** (http://www.sympy.org) is a Python library for **symbolic math**.

In symbolic math, symbols are used to represent mathematical expressions. An example of a symbolic math expression is below:

$$ x^{2} + y^{2} = z $$

In the expression above, we have the variables $x$, $y$ and $z$.

If we …