Answer:
+4 first 2 boxes, 20 third box, 50 last box
Explanation:
first two you add four to get rid of the -4 on the left side, add it to the right as well to make it equal. 16+4 is 20 so that goes in the last box. to get rid of the fraction divide 20 by 2 now you have 1/5 = 10. lastly multiply it by 5 to get rid of the fraction and you come to m=50.