Answer :

TSO
f(x)=16-3x

And we need to evaluate 
f(2a-5). That means x= 2a-5

f(2a-5)= 16- 3(2a-5)
f(2a-5)= 16-(6a-30)
f(2a-5)= 16-6a+30
f(2a-5)=46-6a  

So your answer is ’46-6a’ :)

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