a - b + c = 3 a + b + c = 34 a + 2b + c = 6 a =? b =? c =?

a - b + c = 3 a + b + c = 34 a + 2b + c = 6 a =? b =? c =?

a - b + c = 3
a + b + c = 3
상쇄: 2b = 0 b = 0
a + c = 3
4a + c = 6
상쇄: 3a = 3 a = 1
a + c = 3 c = 3 - a = 3 - 1 = 2