Question

P = 3r + 2s; for s

Answer 1

s= −3r/2+P/2

Answer 2

P = 3r + 2s -- subtract 3r from both sides
P - 3r = 2s -- now divide both sides by 2
(P - 3r)/2 = s or P/2 - 3/2r = s

Answer 3

aP = br + cs
aP - br = cs
(aP - br)(1/c) = s
OR
(aP - br)/c = s