When solving the equation 12x² - 7x = 6 – 2(x² - 1), Evan wrote 12x² - 7x = 6 – 2x² + 2 as his first step. Which property justifies this step?
A.Subtraction property of equality
B.Multiplication property of equality
C.Associative property of multiplication
D.Distributive property of multiplication over subtraction