Question

81:d+3=12 24+8×c=64 32-f:4=7×4

Answer 1

81:d+3=12
81:d=12-3
81:d=9
d=81:9
d=9
24+8×c=64
8×c=64-24
8×c=40
c=40:8
c=5
32-f:4=7×4
32-f:4=28
f:4=32-28
f:4=4
f=4×4
f=16

Answer 2

81:d+3=12
d=81:(12-3)
d=81:9
d=9
(81:9)+3=12

24+8*c=64
c=64:(24+8)
c=64:32
c=2
(24+8)*2=64

32-f:4=7*4
f= (32-(7*4))*4
f=(32-28)*4
f=4*4
f=16
32-(16:4)=7*4
32-4=7*4
28=28