3 . ( 2x - 1 ) - 2 = 13
3 . ( 2x - 1 ) = 12 + 3
3 . ( 2x - 1 ) = 15
2x - 1 = 15 : 3
2x - 1 = 5
2x = 5 + 1 = 6
x = 6 : 2 = 3
Vậy x = 3
\(3\left(2x-1\right)-2=13\)
\(3\left(2x-1\right)=15\)
\(2x-1=5\)
\(2x=6\)
\(x=3\)
3.(2x - 1 ) - 2 = 13
\(\Leftrightarrow\) 3.( 2x - 1) = 15
\(\Leftrightarrow\) 2x- 1 = 15 : 3
\(\Leftrightarrow\) 2x-1 = 5
\(\Leftrightarrow\)2x = 6
\(\Leftrightarrow\) x = 3
Vậy x = 3