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okay in this video were going to look at forming and solving equations uh to do that id rather highly recommend watching the videos forming expressions on corporate maps and then having a look at this video which is forming equations and solving them so lets have a look at a typical question hannah is x years old sophie is four years younger than hannah write an expression for sophies age so to get obviously if hannah was 20 sophie would be 16 because obviously shes four years younger if hannah was 30 sophie would be 26 notice were taking the 4 away from because shes 4 years younger if youre taking the 4 away from whatever age hannah is so the expression would be x subtract four okay next the sum of their ages is 32. find each girls age so the sum number maps the word sum means youre going to add them together so whenever we add hannahs age to sophies age you get 32. so what were going to do is were going to add x and x minus 4. so x plus x is 2x and weve got minus 4. s
