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y = 2x+5
y-5 = 2x
(y-5)/2 = x
fpn1 = (x-5)/2
b. fpn1 (2) = (x-5)/2
2 = (x-5)/2
4 = x-5
9 = x
fpn1(3) = (x-5)/2
3 = (x-5)/2
6 = x-5
11 = x