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(fog)(x)=f[g(x)]
f [g(x)]= 2(4x+5)-1
f [g(x)]= 8x+10-1
f [g(x)]= 8x+9
(gof)(x)= g[f(x)]
g[f(x)] = 4(2x-1)+5
g[f(x)] = 8x-4+5
g[f(x)] = 8x+1