Keep both sides happy
Algebra is where maths stopped counting things and started asking how they relate. Let x be whatever you like. Keep the equals sign level. Do the same thing to both sides. It's basically couples therapy with brackets, and it works considerably more often.
The best algebra shirts don't explain themselves. They reward the second look: two words that sound like a telling-off and turn out to be a lesson in number sets. If someone laughs, they passed. If they ask, you get to teach.
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