How would you use an IF or an OR to test two cells before an either/or answ

I have a Numbers worksheet, and want to check as follows:
If L8 is blank
or
If M8 is blank
Leave this cell blank
Otherwise, L8-M8
The following attempts do not work:
=OR(isblank(f8), OR(isblank(l8), “”,q8-k8)
=IF(f8&l8=””,””,q8-k8)
The Formulas and Functions guide does not seem to help me.
Has anyone successfully figured out something like this. I can do it in Excel, but am quite new to Numbers.
Thanks.

"The following attempts do not work:
=OR(isblank(f8), OR(isblank(l8), “”,q8-k8)
=IF(f8&l8=””,””,q8-k8)
The Formulas and Functions guide does not seem to help me."
Certainly less intuitive than it should be to get to a list of functions and their syntax.
Help menu > Numbers Help > search 'function'
Top hit: Adding Functions to Formulas.
Click show
Click the link to iWork Formulas and Functions help
Click Function reference.
OR is in the Listing of Logical and Informational functions.
Click OR in that list to get information on the syntax for this function.
Your first example is very close to correct:
=OR(isblank(f8), OR(isblank(l8), “”,q8-k8)
=IF(OR(isblank(f8),isblank(l8)),“”,q8-k8)
Your second is ingenious, and at first glance should work if the concatenate operator (&) produces a null result from joining two empty cells. Not something I've ever tried.
Since you want the subtraction only if both cells contain numbers, the following should also give the desired result:
IF(AND(ISNUMBER(F8),ISNUMBER(L8)),Q8-K8,"")
Regards,
Barry

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