Answer:
A = 10, B = 8, C = 2
Explanation:
A + B + C = 20
A = B + 2
C = B - 6
Substituting:
B + 2 + B + B - 6 = 20
3B - 4 = 20
3B = 24
B = 8
Then,
A = 10
C = 2
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