I've been dealing with some equations and I've got a bit of a problem. The equation as follows.
$$t=\frac S{(V\_f+V\_i)/2}$$
I couldn't quite simplify it because on one hand I've got multiplication by the reciprocal rule which states that 
$$t=\frac S1×\frac2{V\_f+V\_i}=\frac{2S}{V\_f+V\_i}$$
and on the other hand I've got the order of operations stating that
$$a/b/c =\frac a{bc}$$
which leads me to
$$t=\frac S{2(V\_f+V\_i)}$$
I'm sure I'm missing something here, but I can't quite get my head around it. Help would be appreciated. Cheers!