![\implies (fog)(x) = f[g(x)] = f(16x-3) = 3-4(16x-3)=3-64x+12=15-64x\neq 12x](/tpl/images/0333/0531/6df41.png)
![\implies (fog)(x) = f[g(x)] = f(\frac{2}{x}) = 6(\frac{2}{x})^2=\frac{24}{x^2}\neq 12x](/tpl/images/0333/0531/f4325.png)
![\implies (fog)(x) = f[g(x)] = f(144x) = \sqrt{144x}=12\sqrt{x}\neq 12x](/tpl/images/0333/0531/7af0f.png)
![\implies (fog)(x) = f[g(x)] = f(3x) = 4(3x)=12x=12x](/tpl/images/0333/0531/c45a7.png)
For which pairs of functions is (f*g)(x)=12x?
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