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9b + b = 2 (<math>\sqrt{9b X b}</math> + 2 )<br>
 
9b + b = 2 (<math>\sqrt{9b X b}</math> + 2 )<br>
 +
10b = 2 (<math>\sqrt{9b^2}</math><br>
 +
10b = 2 ( 3b + 2 )<br>
 +
10b = 6b + 4<br>
207

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