what number is this box
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Sorry for the jumbled explanation in the attachment.
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A+B=8.........(1)
A+C=13.......(2)
B+D=8.........(3)
C-D=6..........(4)
ADD ALL EQUATIONS
2A+2B+2C=35
2*(8)+2C=35
C=19/2
From (4) D=7/2
From (3) B=9/2
From (2) A=7/2
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