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[ P3 = Q3 ]

4x – 18 = 2x + 24
4x – 2x = 24 + 18
2x = 42
x = 42 / 2
x = 21

P2 = 180 – P3
P2 = 180 – (4x – 18)
P2 = 180 – (4 (21) – 18)
P2 = 180 – (84 – 18)
P2 = 180 – 66
P2 = 114