ai jup minh voi
<!DOCTYPE AlgebratorProblem>
<node>
<type>5</type>
<sign>+</sign>
<node string="N" >
<type>2</type>
<sign>+</sign>
</node>
<node>
<type>6</type>
<sign>+</sign>
<node>
<type>8</type>
<sign>+</sign>
<node>
<type>6</type>
<sign>+</sign>
<node string="x" >
<type>2</type>
<sign>+</sign>
</node>
<node string="2" >
<type>3</type>
<sign>+</sign>
</node>
</node>
<node>
<type>6</type>
<sign>+</sign>
<node>
<type>7</type>
<sign>+</sign>
<node string="x" >
<type>2</type>
<sign>+</sign>
</node>
<node showLastChild="0" >
<type>9</type>
<sign>+</sign>
<node string="x" >
<type>2</type>
<sign>+</sign>
</node>
<node string="2" >
<type>3</type>
<sign>+</sign>
</node>
</node>
</node>
<node string="1" >
<type>3</type>
<sign>-</sign>
</node>
</node>
</node>
<node>
<type>8</type>
<sign>+</sign>
<node>
<type>6</type>
<sign>+</sign>
<node showLastChild="0" >
<type>9</type>
<sign>+</sign>
<node string="x" >
<type>2</type>
<sign>+</sign>
</node>
<node string="2" >
<type>3</type>
<sign>+</sign>
</node>
</node>
<node string="1" >
<type>3</type>
<sign>+</sign>
</node>
</node>
<node>
<type>6</type>
<sign>+</sign>
<node string="x" >
<type>2</type>
<sign>+</sign>
</node>
<node showLastChild="0" >
<type>9</type>
<sign>+</sign>
<node string="x" >
<type>2</type>
<sign>+</sign>
</node>
<node string="2" >
<type>3</type>
<sign>+</sign>
</node>
</node>
<node string="1" >
<type>3</type>
<sign>+</sign>
</node>
</node>
</node>
<node>
<type>8</type>
<sign>-</sign>
<node string="1" >
<type>3</type>
<sign>+</sign>
</node>
<node>
<type>6</type>
<sign>+</sign>
<node showLastChild="0" >
<type>9</type>
<sign>+</sign>
<node string="x" >
<type>2</type>
<sign>+</sign>
</node>
<node string="2" >
<type>3</type>
<sign>+</sign>
</node>
</node>
<node string="1" >
<type>3</type>
<sign>-</sign>
</node>
</node>
</node>
</node>
</node>