Question

3x-7=28

Answer 1

Thấy đề nó cứ sai sai

Answer 2

3x -7 = 28 

<=> 3x = 28+7 

<=> 3x = 35 

<=> x = \(\frac{35}{3}\)

Answer 3

\(3x-7=28\)

\(\Leftrightarrow\)\(3x=28+7\)

\(\Leftrightarrow\)\(3x=35\)

\(\Leftrightarrow\)\(x=\frac{35}{3}\)