Yes you have to use the addition property of equality first. why? because you are adding 5 on both sides and when you adding 5 your basically doing the addition property of equality. Depending on the equation you have to use addition property first because the number after the equal sign isnt divisible by the number with the x. For example : 2x - 5 = 3 , if you were to start with dividing 2 on both sides ( division property of equality ) then you are basically diving 3 and 2 which makes it hard for yourself, so Why do you normally use addition property of equality first? just simply to make it easy for yourself.