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Evaluate composite functions: graphs & tables

The tables below show some inputs and outputs of functions ff and gg.
xx8-85-51-1  1~~1  5~~5 12 ~12~
f(x){f(x)}16{16}10{10}2{2}2{-2}10{-10}24{-24}
xx24-244-4  0~~0  4~~4  12~~12  20~~20
g(x){g(x)}19{19}4{4}1{1}2{-2}8{-8}14{-14}
(fg)(12)=(f\circ g)(12)=