Solve the equation: 50-5x=10-x.
解方程：50-5x=10-x．
<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<result>10</result>