What is the solution of the equation 2x-6=15.
方程2x-6=15的解是多少．
<gadget id="calculator">15 + 6</gadget>
<output>21</output>

<gadget id="calculator">21 / 2</gadget>
<output>21/2 = around 10.5</output>

<result>21/2 = around 10.5</result>