\begin{array}{c} \color{#F5FAFF}{F} \color{#9EC1E9}{u} \color{#7DA6D9}{r} \color{#5C8BCD}{i} \color{#7A9CCF}{n} \color{#8BB0D9}{a} \color{#8BB0D9}{F} \color{#7A9CCF}{o} \color{#5C8BCD}{r} \color{#7DA6D9}{c} \color{#9EC1E9}{a} \color{#F5FAFF}{l} \color{#9EC1E9}{o} \color{#FFFFFF}{s} \end{array}

`2x-[x-(3/4x-4)]=13/16`

`2x-(x-3/4x +4)=13/16`

`2x-x+3/4x-4=13/16`

`7/4x-4=13/16`

`7/4x=13/16+4`

`7/4x=77/16`

`x=77/16 : 7/4`

`x=11/4`

Vậy `x=11/4`