Question

p = s + t + u for u

Answer 1

Subtract s and t both the sides and tell me what you get..

Answer 2

u=-s+p-t?

Answer 3

Yes you are right..

You can arrange in more good form like this:

\[u = p - s - t\]

Both are right..

Answer 4

I see, thank you very much

Answer 5

Welcome dear..