{4 x [ 14 + ( 8+ a) : 6] - 7} : 9 += 17-8
= {4 x [ 14 + ( 8+ a) : 6] - 7} : 9=9
={4 x [ 14 + ( 8+ a) : 6] - 7} = 9x9
= 4x [ 14 + ( 8+ a) : 6] - 7=81
=4x [ 14 + ( 8+ a) : 6] = 81+7
= =4x [ 14 + ( 8+ a) : 6] = 88
=14 + ( 8+ a) : 6= 88:4
=14 + ( 8+ a) : 6= 22
= (8+a):6= 22-14
(8+a):6= 8
A+8= 8x6
A+8= 48
A= 48-8
= 40