Question

[{3 x -̀ 54 } . 8 ] : 4 = 18

Answer 1

\(\left[\left(3x-54\right)\cdot8\right]:4=18\\ \Rightarrow8\left(3x-54\right)=72\\ \Rightarrow3x-54=9\\ \Rightarrow3x=63\\ \Rightarrow x=21\)

Answer 2

\(\left[\left(3x-54\right).8\right]:4=18\)

<=> \(\left[24x-432\right]:4=18\)

<=> 24x : 4 - 432 : 4 = 18

<=> 6x - 108 = 18

<=> 6x = 126

<=> x = 21

Answer 3

Ta có: \(\left[\left(3x-54\right)\cdot8\right]:4=18\)

\(\Leftrightarrow3x-54=18:2=9\)

hay x=21