6 a + 2 b + 3 c = 200
3 a + b = 79
______________________ → adun sumele date
9 a + 3 b + 3c = 200 + 79 = 279
3 × ( 3 a + b ) + 3 c = 279
3 × 79 + 3 c = 279
237 + 3 c = 279
3 × c = 279 - 237
c = 42 : 3 ⇒ c = 14
____________________
9 a + 3 b + c = 251
= 3 × ( 3 a + b ) + c =
= 3 × 79 + 14 =
= 237 + 14 =
= 251
Raspuns: a) 251
