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Jan 26, 2016 at 1:25 vote accept David
Jan 25, 2016 at 15:22 comment added David An extremely well written answer. Thanks so much.
Jan 25, 2016 at 6:45 history edited MarcoB CC BY-SA 3.0
Added equation-solving approach
Jan 25, 2016 at 6:24 history answered MarcoB CC BY-SA 3.0