How to solve q =r/2(s+t) for t
\(q= \frac{r}{2(s+t) } \\ q= \frac{r}{2s+2t } \\ q(2s+2t)=r \\ 2s+2t= \frac{r}{q} \\ 2t=\frac{r}{q} -2s \\ t= \frac{\frac{r}{q} -2s}{2} \\t= \frac{\frac{r}{q}}{2}- \frac{2s}{2} \\ t= \frac{r}{2q}-s\)
