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=2(3x+2)-1
=6x+4-1
=6x+3
(gof)(x)=g(f(x))
=3(2x-1)+2
=6x-3+2
=6x-1
(gog)(x)=g(g(x))
=3(3x+2)+2
=9x+6+2
=9x+8
(fof)(x)=f(f(x))
=2(2x-1)-1
=4x-2-1
=4x-3