proce55or
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proce55or
The same here, Mac OS X
It's the Khan Academy [COURSE: INTRO TO COMPUTER SCIENCE - PYTHON](https://www.khanacademy.org/computing/intro-to-python-fundamentals) > [UNIT 1](https://www.khanacademy.org/computing/intro-to-python-fundamentals/x5279a44ae0ab15d6:computational-thinking-with-variables) Lesson 4: Arithmetic expressions