Question

Tìm x

[124 − (20 – 4x)]: 30 = 4

 

Answer 1

\(\Rightarrow124-\left(20-4x\right)=120\\ \Rightarrow20-4x=24\\ \Rightarrow4x=-4\\ \Rightarrow x=-1\)

Answer 2

[ 124 - ( 20 - 4x ) ] : 30 = 4 

=> [ 124 - ( 20 - 4x ) ] : 30 = 4

=> 124 - ( 20 - 4x ) = 120

=> 20 - 4x = 124 - 120

=> 20 - 4x = 4

=>4x = 20 - 4

=>4x = 16

=> x = 16 : 4

=> x = 4

Vậy x = 4 .

Answer 3

\(\left[124-\left(20-4x\right)\right]:30=4\)

\(\Leftrightarrow20-4x=4\)

hay x=4