You can
put this solution on YOUR website!Solve for the indicated variable r+s/t=u.....solve for t
:
Assume you mean:

= u
Multiply both sides by t:
t*

= t(u)
Cancel the t's on the left:
r + s = tu
:
Divide both sides by u and you have:

= t
:
:
If you meant the problem to be: r +

= u, let me know, and I will edit this solution.