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Did you know that there Is a way to change the brightness of your scientific calculator? Try this awesome trick and show it to your friends in school!... | By Casio Calculators
Did you know that there Is a way to change the brightness of your scientific calculator? Try this awesome trick and show it to your friends in school!... | By Casio Calculators
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![How to increase/Decrease Brightness of fx 991ES Casio Calculator [Contras] - YouTube](https://i.ytimg.com/vi/l1GvY0kWOsA/sddefault.jpg "How to increase/Decrease Brightness of fx 991ES Casio Calculator [Contras] - YouTube")