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x + 2 = p
x = p - 2
f(p) = -9
f(p) = 2x - 1 = - 9
2 (p-2) - 1 = -9
2p - 4 - 1 = -9
2p - 5 = - 9
2p = -9 + 5
2p = -4
p = -4 : 2
= -2
= 2x + 4 - 1
= 2x + 3
F(p) = 2p + 3
9 = 2p + 3
2p = 6
p = 3