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fix(curriculum): include an example of a decorator (#58753)

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Co-authored-by: Dario-DC <105294544+Dario-DC@users.noreply.github.com>
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curriculum/challenges/english/07-scientific-computing-with-python/learn-interfaces-by-building-an-equation-solver/662f96576ef178927de87975.md
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@ -9,6 +9,14 @@ dashedName: step-7
In order to be recognized as an abstract method, a method should be decorated with the `@abstractmethod` decorator.
A <dfn>decorator</dfn> is used in Python to modify the behavior of a function. Here's an example of how to use a decorator named `spam`:
```py
@spam
def foo():
pass
```
Modify your import statement to import the `abstractmethod` decorator and decorate both the `solve` and `analyze` methods of the `Equation` class. This will raise two exceptions.
Once a class inheriting from `ABC` has an abstract method, the class cannot be instantiated anymore. Therefore, delete the `Equation` instance to get rid of the error.