a + b = 453
a : b = 4 rest 63
a = 4 b + 63
______________
4 b + 63 + b = 453
5 b = 453 - 63
5 b = 390
b = 390 : 5
b = 78
a = 453 - 78 ⇒ a = 375
Raspuns: a = 375 si b = 78
