Răspuns:
27 : [ 26 + ( 6 x a - 7 x 3) : 9 ] + ( 13 - 2 x 2 x 3 ) = 2
27 : [ 26 + ( 6a - 21 ) : 9 ] + ( 13 - 12 ) = 2
27 : [ 26 + ( 6a - 21 ) : 9 ] + 1 = 2 / x 27
26 + ( 6a - 21 ) : 9 +1 = 54 /-26
( 6a - 21 ) : 9 + 1 = 28/-1
( 6a - 21 ) : 9 = 27 / x 9
6a -21 = 243 /+21
6a =264/:6
a= 44
Sper ca te-am ajutat!
