Răspuns :
a x 89 - 67 = 91073 - 58190
a x 89 - 67 = 32883
a x 89 = 32883 + 67
a x 89 = 32950
a = 32950 : 89
a = 370 rest 2
a x 89 - 67 = 32883
a x 89 = 32883 + 67
a x 89 = 32950
a = 32950 : 89
a = 370 rest 2