Răspuns :
a + b = 53
a : b = 4 rest 3
a = 4b + 3
4b + 3 + b = 53
5b = 53 - 3
b = 50 : 5
b = 10
a = 4 * 10 + 3
a = 43
a : b = 4 rest 3
a = 4b + 3
4b + 3 + b = 53
5b = 53 - 3
b = 50 : 5
b = 10
a = 4 * 10 + 3
a = 43