You cannot "solve" a single equation with 3 unknowns - except in extreme circumstances! And those do not occur here.
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you cant unless you know what the value of P equals
3 + P = 8 Therefore: P = 8 - 3 P = 5
You can combine like terms of p to get 6p. If you are given what p equals you can solve for the completely numerical answer.
P=s r t , so, s= P/(st)