a) x + 25 = 53
x = 53 - 25
x = 28
b) x - 56 = 28
x = 28 + 56
x = 84
c) 56 - x = 17
x = 56 - 17
x = 39
d) 22 - x = 16
x = 22 - 16
x = 6
x + 25 = 53
x= 53 - 25
x = 28
x - 56 = 28
x = 28 + 56
x = 84
56 - x = 17
x = 56 - 17
x = 39
22 - x = 16
x = 22 - 16
x = 6