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If a=2bc+db= (a - d) / 2c
If a=2b+c
b=1/2(a-c)
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a=2 BC - d is c=2(a + b)
c= a-2b
a-2b=c
d=a-2bc
(a+d)/2b=c
d = a - 2bc
c= (a+d) / 2b
None.