Consider the sequence of steps to solve the equation:
x - 3
= x + 3
3

step 1 ⇒ x - 3 = 3(x + 3)
step 2 ⇒ x - 3 = 3x + 9
step 3 ⇒ x = 3x + 12
step 4 ⇒ -2x = 12
step 5 ⇒ x = -6

identify the property of equality which yields step 5.
a) division property
b) addition property
c) subtraction property
d) multiplication property