Answer:
m=19
Explanation:
You can look at it and notice that its a 180 degree line meaning that the 84, is one piece of the angle. So you must subtract it from 180-84=96 and then you know that 5m+1=96. You can subtract 1 from each side to get 5m=95, then you must cancel out m by dividing it by 5 and you get m = 19.