$\"\"$

The equation is $\"\"$ .

Apply addition property of equality: Add 3 to each side.

$\"\"$

$\"\"$ (Apply additive inverse property: $\"\"$ )

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

Apply multiplication property of equality: Multiply each side by 7.

$\"\"$

$\"\"$ (Cancel common terms)

$\"\"$ (Apply multiplicative identity property: $\"\"$ ) $\"\"$

Check:

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

$\"\"$

$\"\"$ (Cancel common terms)

$\"\"$ (Subtract: $\"\"$ )

The equality is true. $\"\"$

The value of $\"\"$ .