$\"\"$ $\"\"$

The diagram is

$\"\"$

From the diagram, write an equation to find x.

$\"\"$ $\"\"$

$\"\"$ (Group like terms)

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

According to subtraction property of equality: If a = b then a – c = b - c.

$\"\"$ (Subtract 9 from each side)

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

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

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

$\"\"$ (Divide each side by 4)

$\"\"$ (Cancel common terms) $\"\"$

The solution is $\"\"$ .