I live in Australia and don’t recall my school at all teaching me this in maths class

They taught us stuff like radius and area of a circle but not this

Edit:

Also counterpoint, people exist that live in other countries and every countries education system is different

You need to actually use your brain

Its like a muscle and if you don’t use muscles they acclimate to the lack of use

Its because its:

2+5×(8−5)

My calculator app automatically added it when typing in what was in the image and “2+5×(8−5)” does equal 17.

It’s absolutely the fault of the person making the social media media post for not writing it properly and confusing people.