What Times 3 Equals 500

Minus plus equal multiply 90 mistake spot prove equals "prove" 90 equals 100. can you find the mistake?

"Prove" 90 Equals 100. Can You Find The Mistake? - YouTube

Minus multiply by minus equal to plus

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Minus Multiply By Minus Equal to Plus - YouTube

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"Prove" 90 Equals 100. Can You Find The Mistake? - YouTube