SOLUTION: <img src="https://screenshotscdn.firefoxusercontent.com/images/11a4e984-139b-47fa-afc5-425ecec0313b.png">
Algebra.Com
Question 1138061: 
Answer by ikleyn(52790) (Show Source): You can put this solution on YOUR website!
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Multiply the second equation by 2 (both sides) and then subtract from the first equation.
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