When solving the equation, what property was used to go from step 3 to step 4?

Step 1: -(2x+3= x-18
Step 2: -2x-3=x-18
Step 3: -3=3x-18
Step 4: 15=3x

A)APOE
B)SPOE
C)MPOE
D)DPOE

3 answers

you added 18 to each side, isn't that the equality property of addition?
thank you
B- spoe!!!