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f(x)=x-3 g(x)=x+x=2
( g o f) (x) = f(x)+f(x)=2
x-3+x-3=2
2x=8
x=4
g(x)=x+x2
g(x)=2x-2
(g o f)(x)=g(f(x))
=g(x-3)
=2(x-3)-2
=2x-6-2
=2x-8