Answer:7x
Step-by-step explanation: you subtract 12 from 5 and you will get positive 7x and if you wanna check do -5x + 12 = 7x the x is 1 so you will do the opposite for the 7x and it will be -7x then subtract it from 12 and get 5 then do 5x=5 since it multiplying 5 times 1 then you do the opposite so divide and get divided 5 then do the same to the other side the =5 which will be 1 done.