$\"\"$

The equation is $\"\"$ . \ \

According to addition property of equality; if a = b than a + c = b + c.

$\"\"$ (Add 3x to each side)

$\"\"$ (Additive inverse property: $\"\"$ )

$\"\"$ (Add: $\"\"$ ) $\"\"$

$\"\"$ (Divide each side by 9)

$\"\"$ (Cancel common terms)

$\"\"$

Verify:

To check the solution, substitute $\"\"$ in original equation.

$\"\"$

$\"\"$ (Add: $\"\"$ )

Compare the values, the equation is true.

$\"\"$

The value of x is $\"\"$ .