The answer is 42 because 3(y-2)=to get 18 you find out what will = 18 so 20-2=18 then multiply that 20 by 3 which is 60 so no we now that the y is = to 20 and put both together which that is 60. so now we have to find what is missing ,so I did and 60-42=18 Hoped this helped I did all the work correctly