<p>Okay. I got S alone, but it doesn't look like you said it would.
I got:
S=R1/C</p>
<p>if it is just an expression and not an equation, there is no way to solve for S. It is only possible to simplify the expression - there is no equality.</p>
<p>Well, actually, I used what I had found above (1/R1+1) and set it equal to the original. If you do that, you get what I got right above you.</p>