--description--

An <dfn>interface</dfn> is like a blueprint for a class. An interface contains a set of methods and properties that a class should implement.

Start this project by declaring an empty class named Equation. You will use this class to define an interface, a blueprint for a generic equation.

--hints--

You should define a new class named Equation.

({ test: () => assert(runPython(`_Node(_code).has_class("Equation")`)) })

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