4+2 x {26-2 x [ 10-100 : ( 5+1 x a )]} : 4 = 8 / x 4
4+2 x { 26-2 x [ 10-100 : ( 5+1 x a )]} = 32/-4
2 x { 26-2 x [ 10-100 : ( 5 +1 x a )]} = 28 / : 2
26-2 x [ 10-100 : ( 5+1 x a)] = 14/+26
2 x [ 10-100 : ( 5+1 x a )] = 40/ : 2
10-100 : (5+1 x a ) = 20/+10
100 : ( 5+1 x a )= 30/x 100
5+1 x a = 300 /-5
1 x a = 255 / : 1
a = 255
Sper ca te-am ajutat!