When solving the equation 12x^2 - 7x = 6-2(x^2 - 1). Evan wrote 12x^2 - 7x = 6 - 2x^2 + 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​