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Head-scratching grade school math sum divides people... can you remember the golden rule?

A grade-school math problem has stumped people. Can you solve the equation?
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Math problem divides people as they struggle to solve sum - can you remember the 'golden rule'?

The math you thought you would never use again from school is back to haunt you. X users are in an uproar over an equation that @BholanathDutta posted. It appears as a simple equation, but the comment ...