how can the first example isnt injective. ? i cant understand. and if we consider two element  such that x1 and x2 belong to X. such that f[x1]=f[x2].please help me to clear this example.

f(x)=l2x-5l

if we put x=3 we get f(x)=1

we get 1 also when we put x=2

therofore 2 element in domain associated with same element in codomain

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