The equation v/2 -21=-15 is solved in several steps below. For each step, choose the reason that best justifies it.

Step. Reason
* v/2-21=-15

v/2-21+21=-15+21

v/2=6

2·v/2=6·2

v=12

Options!

*Given equation
a. addition property of equality
b. subtraction propertyof equality
c. multiplication property of equality
d. division property of equality
e. simplifying
f. distributive property