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‘At the stroke of midnight, your brother will be hurtling sideways at an altitude of 150 meters’ is a regular physics prediction about your nonmagical trebuchet, whereas ‘you are cursed to build a brother-launching trebuchet’ falls out of the Lagrangian.
There is a real good argument to be made that math is a language.
So you didn’t fail math you are just illiterate. Not really sure if that is better though…