If x=2 is the solution of the equation 8+x=4+m, what should be the value of m.
如果x=2是方程8+x=4+m的解，那么m的值应该是多少．
<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<result>6</result>