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A=B+2C , 3B = 2C +D ,A+2B = 2D How many B = D

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    A-2C = B (#1)
    2C = 3B-D (#2), so

    A-(3B-D) = B
    A-3B+D = B
    A+D = 4B
    A = 2D-2B (#3). so

    2D-2B+D = 4B
    3D = 6B
    D = 2B

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