How they get 9:
6 / 2(2+1)
6 / 2 * 3
At this step they remove the parentheses and do implied multiplication and evaluate left to right. they are dividing 6 by 2 first and getting 3 so now it's
3(3) which is equal to 9.
In higher level mathematics multiplication by adjacency to parentheses tends to take precedence over multiplication from left to right and a division sign isnt used so it would instead be treat we as a fraction like this and become this:
6 /2(2+1) can be simplified to
6 / 2(3)
Thus the fraction 6 / 6
Which would give you 1.
It can be fixed to make the problem less ambiguous by writing it in fractional notation using the method @Arithmetic posted in his solution.
Long story short the answer is 1 but 9 is acceptable as well.
Ok. Maybe I don't know higher level mathematics or something.
Cause that sht looks like some 4th grade math problem and it's simply just 1

