Solve the equation: ((x)/2)+(13/2)=3+x.
解方程：((x)/2)+(13/2)=3+x．
<gadget id="calculator">13 / 2</gadget>
<output>13/2 = around 6.5</output>

<gadget id="calculator">(13/2) - 3</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(7/2) / (1/2)</gadget>
<output>7</output>

<result>7</result>