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f(1) ⇒ 2x + 1 = 1
2x = 1 - 1
x = 0
x = 0/2
x = 0
f(3) ⇒ 2x + 1 = 3
2x = 3 -1
x = 2/2
x = 1
f(5) ⇒ 2x + 1 = 5
2x = 5 -1
x = 4/2
x = 2
f(9) ⇒ 2x + 1 = 9
2x = 9-1
x = 8/2
x = 4
f(11) ⇒ 2x + 1= 11
2x = 11-1
x = 10/2
x = 5