We compare s+12 > 20 with s > ___ We notice that the first has a +12 on the left and the second one doesn't. Then to make the first one look like the second one we must get rid of the +12. To do that we must add the opposite of +12 which is -12 to both sides of the inequality: s+12 > 20 becomes s+12-12 > 20-12 Then when we simplify we just get: s > 8 Edwin