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Old 01-18-2013, 07:21 PM  
ilnjscb
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(a+b)/2=90; (a+c)/2=150
(a+b)/2=((a+c)/2)-60
a/2 + b/2=a/2 + c/2 -60
b/2=c/2 -60
b/2-c/2=c/2-c/2-60
(b-c)/2=-60
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