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Given that `f(x) = 7x-1 ` and `g(x) = 3x-6 `, determine each of the following. Make sure to fully simplify your answer.
(a) `(f\circ g)(x)`=  
(b) `(g\circ f)(x)`=  
(c) `(f\circ f)(x)`=  
(d) `(g\circ g)(x)`=  

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