$\"\"$ $\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\"$

The equation is $\"\"$

Subtraction property of equality: If a = b then a – c = b – c. \ \ $\"\"$ (Subtract 20 from each side)

$\"\"$ (Commutative property: a + b = b + a )

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

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

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

$\"\"$ (Divide each side by negative 3)

$\"\"$ (Cancel common terms)

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

The value of $\"\"$