Answer:
[tex]u=\frac{t}{k+v}[/tex]
Step-by-step explanation:
Factorise out 'u'
[tex]uk+uv=t[/tex]
[tex]u(k+v)=t[/tex]
Divide by 'k+v' to get 'u' by itself
[tex]u=\frac{t}{k+v}[/tex]
Hope this helped!! Ask me if there's any part of the working you don't understand :)