Answer:
see below
Step-by-step explanation:
2p + 8 = 20 - p
add p to both sides
2p + p + 8 = 20 - p + p
combine like terms
3p + 8 = 20
subtract 8 from both sides
3p + 8 - 8 = 20 - 8
combine like terms
3p = 12
divide both sides by 3
3p / 3 = p
12/3 = 4
we're left with p = 4
