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Prove or disprove each of the following claims:
(a) The function f:R→R defined by f(x)=2x+5 is a bijection.
(b) The function g:Z→Z defined by g(x)=2x+5 is a bijection.

A) Both claims are true
B) Both claims are false
C) Claim (a) is true, claim (b) is false
D) Claim (a) is false, claim (b) is true

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