1. ## solving for variable

t = 8(p+q) / pq

Make q the subject of the formula.

I would like to know how to solve it.

2. Strategy:

- get all terms in q at one side, terms without q at the other site
- factorise q and divide both sides by its coefficient.

Here's a start:

$
t = 8\frac{{p + q}}{{pq}} \Leftrightarrow pqt = 8p + 8q \Leftrightarrow pqt - 8q = 8p
$