# Learn Interfaces by Building an Equation Solver - Step 67

**URL:** <https://forum.freecodecamp.org/t/learn-interfaces-by-building-an-equation-solver-step-67/723429>\
**Category:** Curriculum Help\
**Created:** [December 3, 2024, 2:51pm UTC](https://forum.freecodecamp.org/t/learn-interfaces-by-building-an-equation-solver-step-67/723429 "2024-12-03T14:51:31Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![pkdvalis](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/pkdvalis/32/350571_2.png) [@pkdvalis](https://forum.freecodecamp.org/u/pkdvalis)\
**Post date:** [December 3, 2024, 3:29pm UTC](https://forum.freecodecamp.org/t/learn-interfaces-by-building-an-equation-solver-step-67/723429/2 "2024-12-03T15:29:32Z")

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I’ve edited your code for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (`</>`) to add backticks around text.

 ![Pre-formatted-text](https://global.discourse-cdn.com/freecodecamp/original/3X/1/b/1b18854f1059217f29370444396145cc3a0cd8ae.gif)

See [this post](https://forum.freecodecamp.org/t/forum-code-formatting/25574) to find the backtick on your keyboard.  
**Note:** Backticks (`) are not single quotes (').

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