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

The equation is “ $\"\"$ ”

According to subtraction property of equality: If a = b then a $\"\"$ c = b $\"\"$ c

$\"\"$ (Subtract 18 from each side)

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

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

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

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

The value of d is 6.