WALT use algebra to solve problems - add / sub

4 + 5 = c

c = 9

43 - x = 30

x = 30

43 - 30 = x

2 + 5 = 7

5 + 2 = 7

7 - 2 = 5

7 -5 = 2

35 - d = 12

d = 23

f - 9 = 29

f = 38

38 + y = 38

y = 0