(fog) (x) =2x+5
f(g(x))=2x+5
f(2x+3)=2x+5
f(2x+3)=(2x+3)+2
f(x)=x+2
f^-1(x)=x-2
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(fog) (x) =2x+5
f(g(x))=2x+5
f(2x+3)=2x+5
f(2x+3)=(2x+3)+2
f(x)=x+2
f^-1(x)=x-2