This is actually a generational thing. Millennials were taught “PEMDAS”:

1. Parenthesis
2. Exponent
3. Multiplication
4. Division
5. Addition
6. Subtraction

But younger generations have been taught “BEDMAS” instead:

1. Brackets
2. Exponent
3. Division
4. Multiplication
5. Addition
6. Subtraction

Notably, Division and Multiplication are swapped on PEMDAS and BEDMAS, to make this “both happen at the same time” more straightforward. But that only applies if the entire operation can happen at the same time.

For instance, let’s say 6/2(3) compared to 6÷2(3). At first glance, they both appear to be the same operation. But in the former, the 6 dividend would be over the entire 2(3) divisor. Which means you would need to simplify the divisor (by resolving the multiplication of 2•3) before you divide. So the former would simplify to 6/6=1, while the latter would divide first and become 3(3)=9.

Technically, if you wanted to be completely clear, you would write it using multiple parenthesis as needed. For instance, you would write it as either:
(6÷2)(3)=9 or 6÷(2(3))=1 to avoid the ambiguity. Then it wouldn’t matter if you’re using PEMDAS or BEDMAS.

Usually, no sign before the bracket means juxtaposition. Scientific calculators do account for it (not all, tho), while regular ones may not.

So 2(1+2) is really (2+4)

Compare 2/2x and 2/2×X where x is (1+2)

The first is 2/(2+4)=1/3, the second is (2/2)×(1+2)=3

Basically, either 1 or 9 can be considered correct. And yes, it's ambiguous.

Also, there's no real rule about solving left to right due to associative and commutative properties: 1×2×3 = 1×(2×3) = (1×2)×3 = 3×1×2 = 2×1×3 = 6

would you say the same thing if the division was written out like a line under 2(3) and under that 6
idk how this'll come out but something like this:
2(1+2)
-----------
6

edit : wow i did a formatting thing
edit2: i got it (ish)