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Cobretti2 said:

That is a well known bug in cheap calculators (that apparently still exists today). They do not correctly resolve the missing * in 2(3+9) leading to the false result 2.

>48 / 2(3 + 9)
*>48 / (6 +18) - You could distribute the 2 here.
>48 / 24

*This is the fault these calculators make, essentially. Breaking the left to right evaluation with a distribution step.