Posted by Anonymous on Friday, April 1, 2011 at 2:29pm.
There are in fact three cases.
Case 1: (seemingly obvious case)
E-----D--------B
ED=10
DB=3x-8
EB=10+3x-8=3x+2
Case 2:
E-----B-------D
ED=10
DB=3x-8
EB=10-(3x-8)=18-3x=3(6-x)
Case 3:
D-----E--------B
ED=10
DB=3x-8
EB=3x-8 - 10 = 3x-18=3(x-6)
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