Assume that I have 3 scaled variables: $a$, $b$ and $c$. I would like to write a formula to get the sum of all these variables. Currently, what I have is as follows:
$$x = \left(\frac{1}{1 + \textrm{a}}\right) + \left(\frac{1}{1 + \textrm{b}}\right) + \left(\frac{1}{1 + \textrm{c}}\right)$$
This looks weird and I am not sure if there is any ways to simplify this. Thanks.
Your expression is quite clear. You could write it as $$\frac {(1+a)(1+b)+(1+b)(1+c)+(1+a)(1+c)}{(1+a)(1+b)(1+c)}$$ but that doesn't look simpler to me. You could then expand out the numerator or denominator but I don't think that helps anything, either.