$\"\"$

The proportion is $\"\"$ .

Apply cross product property: If $\"\"$ , then $\"\"$ .

$\"\"$ (Cross products)

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

Apply division property of equality: Divide each side by 10.

$\"\"$

$\"\"$ (Cancel common terms)

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

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

$\"\"$

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

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

The value of $\"\"$ .