f(g(x) =
put in the function g(x) in for x in the function f(x)
f(g(x) = 2(g(x)) +3
substitute 5x-6 for g(x)
= 2 (5x-6) +3
distribute
= 10x -12 +3
combine like terms
= 10x-9
f(g(x) = = 10x-9
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