If A + B = 2C and C + D = 2A , the *2 pointsA + C = B + DA + C = 2DA + D = B + CA + C = 2B
If A + B = 2C and C + D = 2A , the *
2 points
A + C = B + D
A + C = 2D
A + D = B + C
A + C = 2B

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