Posted by Ludjmy on Monday, November 21, 2011 at 1:44pm.
http://www.wolframalpha.com/input/?i=2a%2Bc%3D-10%2C+b-c%3D15%2C+a-2b%2Bc%3D-5+
2a+c=-10, b-c=15, a-2b+c=-5
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