Question

{[(8+a+a):4+4]×8-8}:8=7

Answer 1

{[(8+a+a):4+4]×8-8}:8=7
[(8+a+a):4+4]×8-8 = 7 × 8 = 56
[(8+a+a):4+4]×8 = 56 + 8 = 64
(8+a+a):4+4 = 64 : 8 = 8
(8+a+a):4 = 8 - 4 = 4
8+a+a = 4 × 4 = 16
a+a = 16 - 8 = 8
2 × a = 8
a = 8 : 2
a = 4

Answer 2

{[(8+a+a):4+4]×8-8}:8=7
[(8+a+a):4+4]×8-8=8x7
[(8+a+a):4+4]×8-8=56
[(8+a+a):4+4]×8=56+8
[(8+a+a):4+4]×8=64
(8+a+a):4+4 = 64:8
(8+a+a):4+4 = 8
(8+a+a):4 = 8-4
(8+a+a):4 = 4
8+a+a = 4x4
8+a+a = 16
a+a=16-8
a+a=8
2xa=8
a=8:2
a=4