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Grade school math test sum leaves people perplexed - can you remember the special rule to solve it?

One simple rule can help solve any complex equation. Here's a hint: all it takes is a catchy acronym.
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Head-scratching grade school math sum divides people... can you remember the golden rule?

A grade-school math problem has left people perplexed, can you solve the simple-looking equation in just 30 seconds? The sum, posted to X by BreakTheSilos, that regularly shares brainteasers, is: 12 - ...