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Let f(x)=a x+b and g(x)=c x+d , a!=0. As...

Let `f(x)=a x+b and g(x)=c x+d , a!=0.` Assume `a=1,b=2.` If `(fog)(x)=(gof)(x)` for all `x ,` what can you say about `c and d ?`

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