When you plug in (0,0,0) into 7x - 5y + z = 0. It holds true, however, when you plug in (1,1,1) into 5x - 4y + 2z = 3, shouldn't the answer come out to be 0? Which verifies the problem. I tried it myself and got pi2 is equal to x + y -4z + 2 = 0 but Don't know if it's right.

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