1. 63 411 - 5 291 = 58 120 (diferenta)
2. a - 165 291 = 309 716 => a=309 716 + 165 291 => a=475 007 (descazut)
3. 432 508 - a = 423 508 => a= 432 508 - 423 508 => a=9 000 (scazator)
4. 197 645 + a = 394 575 => a = 394 575 - 197 645 => a= 196 930 ( termen 2)
