Q: 
 
a `\color` and a math equation environment with \makebox 
 
For some reasons I have to do an highschool homework in LaTeX. I need some help!  
I want to draw the following picture: 
 
I have two problems.  
First, I don't know how to "spread out" \makebo0, so that I get 3 drawn pieces instead of only one rectangle to fill the whole canvas. 
When 6add127376 talcal 
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