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11 + x = 9
x = 9 - 11
x = - 2
- y - 27 = - 54
- 27 + 54 = y
27 = y
y = 27
4 - z = 19
4 - 19 = z
- 15 = z
- 16 = - 12 + 2p
- 16 + 12 = 2p
- 4 = 2p
- 4/2 = p
- 2 = p