6 / 2(1+2) = 9 not 1

In mathematics notation a multiplication sign can be omitted. So a x b = ab. 2(1+2) = 2 x 3.

So correctly expanded, the above is:

6 / 2 * (1 + 2) = 6 / 2 * 3 = 9

If it was a function, then you would be correct. But the notation for a function is f(x).

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