A - 4B + 2C = 16
2A + 7B - 5C = 83
A + B - C = ?

Answer

33

A + 2A - 4B + 7B + 2C - 5C = 16 + 83
3A + 3B - 3C = 99 => 3(A + B - C) = 99
=> A + B - C = 99/ 3 =>
A + B - C = 33

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