d = -196
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If: a = b+c+d Then: c = a-b-d
6d = c Divide both sides by 6: d = c/d
c= (a+d) / 2b
bx+cy=d bx=d-cy x=d-cy ----- b answer: d-cy ----- b
There is not sufficient information to answer the question. To solve for two unknown variables (d and m) you need two independent equations.