Work Step by Step
We need to show that $f(g(x))=x=g(f(x))$ $f(g(x))=f(5x+5)=0.2(5x+5)-1=x+1-1=x$ $g(f(x))=g(0.2x-1)=5(0.2x-1)+5=x-5+5=x$ Thus we proved what we had to.
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