![LHS=2[(3)^2+(4)^2+(5)^2+(6)^2+(7)^2]](/tpl/images/1323/7554/ecba4.png)
![LHS=2[9+16+25+36+49]](/tpl/images/1323/7554/52093.png)
![LHS=2[135]](/tpl/images/1323/7554/49143.png)
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