Answer:
The solution for u is:
[tex]u = \frac{mpq}{q+p}[/tex]
Step-by-step explanation:
The first step to solve this problem is finding the least common multiplicator between p and q, that is pq, so:
[tex]\frac{u}{p} + \frac{u}{q} = m[/tex]
[tex]\frac{uq + up}{pq} = m[/tex]
[tex]uq + up = mpq[/tex]
[tex]u(q + p) = mpq[/tex]
[tex]u = \frac{mpq}{q+p}[/tex]
