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The three planes 9x - 3y + 4z = 3, x + 2...

The three planes `9x - 3y + 4z = 3, x + 2y + 2z = 5` and `21x + ay + bz = 3` intersect at a point `A` on `XOY` plane and at a point `B` on `Xoz` where `O` is the origin. If the area of triangle `AOB` is `k,` then `k +(a+b)/2` is equal to

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