Posted by wan on Saturday, November 24, 2012 at 9:43am.
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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