I'm unable to understand what use a "+" sign has if it is put before a formula.
For ex: +(C13*(1+$M$10)+J13)/(1-$M$12) gives the same result as
(C13*(1+$M$10)+J13)/(1-$M$12).
I assume you mean that +(C13*(1+$M$10)+J13)/(1-$M$12) give rhe same result
as =(C13*(1+$M$10)+J13)/(1-$M$12)
I believe that this was to make Excel compatable with Lotus which was the
eading spreadsheet program when XL came out.

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> I'm unable to understand what use a "+" sign has if it is put before a
> formula.
> For ex: +(C13*(1+$M$10)+J13)/(1-$M$12) gives the same result as
> (C13*(1+$M$10)+J13)/(1-$M$12).