f: R-{1,2} ---> R-{2,4} & x --> f(x) = 2x
f: R-{1,2} ---> R-{2,6} & x --> f(x) = 4x+(-2)
f: R-{1,2} ---> R-{2,8} & x --> f(x) = 6x+(-4)
f: R-{1,2} ---> R-{2,2k} & x --> f(x) = (2k+(-2))x+(-1)(2k+(-4))
(2k+(-2))+(-1)(2k+(-4)) = 2
(4k+(-4))+(-1)(2k+(-4)) = 2k
f: R-{1,2} ---> R-{2,3} & x --> f(x) = x+1
f: R-{1,2} ---> R-{2,5} & x --> f(x) = 3x+(-1)
f: R-{1,2} ---> R-{2,7} & x --> f(x) = 5x+(-3)
f: R-{1,2} ---> R-{2,(2k+1)} & x --> f(x) = (2k+(-1))x+(-1)(2k+(-3))
(2k+(-1))+(-1)(2k+(-3)) = 2
(4k+(-2))+(-1)(2k+(-3)) = 2k+1
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