a) b-c=d+e/2
2b-2c=d+e
e=2b-2c-d
b) a-b=ca+d/2
a-b-d/2=ca
(a-b-d)/2a=c
c= (a-b-d)/2a
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a) b-c=d+e/2
2b-2c=d+e
e=2b-2c-d
b) a-b=ca+d/2
a-b-d/2=ca
(a-b-d)/2a=c
c= (a-b-d)/2a