Question 247184
Good question!
A lot of questions on this site don't get answered because they are ambiguous.
Let's take a tougher one. x+1/x-2. Is this x + (1/x) -2 or (x+1)/(x-2) Parentheses clarify the issue.
18/(2a) is a clear way to write the problem.
Another way is {{{18/(2a)}}}.
18 / 2a written this way I would give an answer of 3.
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Ed