$\"\"$

\

The equation is $\"\"$ .

\

Apply addition property of equality: Add 5.2 to each side.

\

$\"\"$

\

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

\

$\"\"$ (Add: 2.15 + 5.2 = 7.35) $\"\"$

\

Apply Subtraction property of equality: Subtract 4.33j from each side.

\

$\"\"$

\

Apply commutative property of addition: a + b = b + a.

\

$\"\"$

\

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

\

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

\

Apply division property of equality: Divide each side by 2.45.

\

$\"\"$

\

$\"\"$ (Cancel common terms)

\

$\"\"$ (Divide: $\"\"$ ) $\"\"$

\

Check:

\

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

\

$\"\"$

\

$\"\"$ (Multiply: $\"\"$ )

\

$\"\"$ (Add: 12.99 + 2.15 = 15.14)

\

15.14 = 15.14 (Subtract: $\"\"$ )

\

The equality is true. $\"\"$

\

The value of $\"\"$ .