Răspuns :
3=6-a : 9
a :9= 6-3
a : 9 =3
a=9 * 3
a = 27
Verificare :
(13-3*4)*18:6=6-27:9
(13-12) * 3 = 6-3
3=3 (A)
a :9= 6-3
a : 9 =3
a=9 * 3
a = 27
Verificare :
(13-3*4)*18:6=6-27:9
(13-12) * 3 = 6-3
3=3 (A)